build: Support Visual Studio builds using NMake

This adds a set of NMake Makefiles that can be used to build HarfBuzz, from
the standard basic build building the minimal HarfBuzz DLL (consisting
of OpenType, fallback and Uniscribe support only), to a full fledged build
consisting of GLib and FreeType support, as well as building the utilities,
the test programs in src/ and test/api, and HarfBuzz-ICU and
HarfBuzz-GObject, and up to building the introspection files.  This means a
flexible build mechanism is supported here, so anything that is supported
for a Windows build (code-wise), should all be supported by this build
system.

As in an earlier commit, the source listings are shared with the autotools
builds with the various Makefile.sources in src/, src/hb-ucdn and util/, and
this set of NMake Makefiles will transform these lists into the form they
want.

In the current form, all the test programs in test/api pass, and this has
been checked successfully with 'make -j8 distcheck'.
diff --git a/win32/build-rules-msvc.mak b/win32/build-rules-msvc.mak
new file mode 100644
index 0000000..03b3833
--- /dev/null
+++ b/win32/build-rules-msvc.mak
@@ -0,0 +1,140 @@
+# NMake Makefile portion for compilation rules
+# Items in here should not need to be edited unless
+# one is maintaining the NMake build files.  The format
+# of NMake Makefiles here are different from the GNU
+# Makefiles.  Please see the comments about these formats.
+
+# Inference rules for compiling the .obj files.
+# Used for libs and programs with more than a single source file.
+# Format is as follows
+# (all dirs must have a trailing '\'):
+#
+# {$(srcdir)}.$(srcext){$(destdir)}.obj::
+# 	$(CC)|$(CXX) $(cflags) /Fo$(destdir) /c @<<
+# $<
+# <<
+{..\src\}.cc{$(CFG)\$(PLAT)\harfbuzz\}.obj::
+	$(CXX) $(CFLAGS) $(HB_DEFINES) $(HB_LIB_CFLAGS) /Fo$(CFG)\$(PLAT)\harfbuzz\ /c @<<
+$<
+<<
+
+{..\src\hb-ucdn\}.c{$(CFG)\$(PLAT)\harfbuzz\}.obj::
+	$(CC) $(CFLAGS) /Fo$(CFG)\$(PLAT)\harfbuzz\ /c @<<
+$<
+<<
+
+{..\src\}.cc{$(CFG)\$(PLAT)\harfbuzz-icu\}.obj::
+	$(CXX) $(CFLAGS) $(HB_LIB_CFLAGS) $(HB_ICU_CFLAGS) /Fo$(CFG)\$(PLAT)\harfbuzz-icu\ /c @<<
+$<
+<<
+
+{..\util\}.cc{$(CFG)\$(PLAT)\util\}.obj::
+	$(CXX) $(CFLAGS) $(HB_DEFINES) $(HB_CFLAGS) /Fo$(CFG)\$(PLAT)\util\ /c @<<
+$<
+<<
+
+# Inference rules for building the test programs
+# Used for programs with a single source file.
+# Format is as follows
+# (all dirs must have a trailing '\'):
+#
+# {$(srcdir)}.$(srcext){$(destdir)}.exe::
+# 	$(CC)|$(CXX) $(cflags) $< /Fo$*.obj  /Fe$@ [/link $(linker_flags) $(dep_libs)]
+{..\src\}.cc{$(CFG)\$(PLAT)\}.exe:
+	$(CXX) $(CFLAGS) $(HB_DEFINES) $(HB_CFLAGS) $< /Fo$*.obj  /Fe$@ /link $(LDFLAGS) $(CFG)\$(PLAT)\harfbuzz.lib $(HB_TESTS_DEP_LIBS)
+
+{..\test\api\}.c{$(CFG)\$(PLAT)\}.exe:
+	$(CXX) $(CFLAGS) $(HB_DEFINES) $(HB_CFLAGS) /DSRCDIR="\"../../../test/api\"" $< /Fo$*.obj /Fe$@ /link $(LDFLAGS) $(CFG)\$(PLAT)\harfbuzz.lib $(HB_TESTS_DEP_LIBS)
+
+# Rules for building .lib files
+$(CFG)\$(PLAT)\harfbuzz.lib: $(HARFBUZZ_DLL_FILENAME).dll
+$(CFG)\$(PLAT)\harfbuzz-icu.lib: $(HARFBUZZ_ICU_DLL_FILENAME).dll
+$(CFG)\$(PLAT)\harfbuzz-gobject.lib: $(HARFBUZZ_GOBJECT_DLL_FILENAME).dll
+
+# Rules for linking DLLs
+# Format is as follows (the mt command is needed for MSVC 2005/2008 builds):
+# $(dll_name_with_path): $(dependent_libs_files_objects_and_items)
+#	link /DLL [$(linker_flags)] [$(dependent_libs)] [/def:$(def_file_if_used)] [/implib:$(lib_name_if_needed)] -out:$@ @<<
+# $(dependent_objects)
+# <<
+# 	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;2
+$(HARFBUZZ_DLL_FILENAME).dll: config.h $(harfbuzz_dll_OBJS) $(CFG)\$(PLAT)\harfbuzz
+	link /DLL $(LDFLAGS) $(HB_DEP_LIBS) /implib:$(CFG)\$(PLAT)\harfbuzz.lib -out:$@ @<<
+$(harfbuzz_dll_OBJS)
+<<
+	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;2
+
+$(HARFBUZZ_ICU_DLL_FILENAME).dll: $(CFG)\$(PLAT)\harfbuzz.lib $(harfbuzz_icu_OBJS) $(CFG)\$(PLAT)\harfbuzz-icu
+	link /DLL $(LDFLAGS) $(CFG)\$(PLAT)\harfbuzz.lib $(HB_ICU_DEP_LIBS) /implib:$(CFG)\$(PLAT)\harfbuzz-icu.lib -out:$@ @<<
+$(harfbuzz_icu_OBJS)
+<<
+	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;2
+
+$(HARFBUZZ_GOBJECT_DLL_FILENAME).dll: $(CFG)\$(PLAT)\harfbuzz.lib $(harfbuzz_gobject_OBJS) $(CFG)\$(PLAT)\harfbuzz-gobject
+	link /DLL $(LDFLAGS) $(CFG)\$(PLAT)\harfbuzz.lib $(HB_GOBJECT_DEP_LIBS) /implib:$(CFG)\$(PLAT)\harfbuzz-gobject.lib -out:$@ @<<
+$(harfbuzz_gobject_OBJS)
+<<
+	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;2
+
+# Rules for linking Executables
+# Format is as follows (the mt command is needed for MSVC 2005/2008 builds):
+# $(dll_name_with_path): $(dependent_libs_files_objects_and_items)
+#	link [$(linker_flags)] [$(dependent_libs)] -out:$@ @<<
+# $(dependent_objects)
+# <<
+# 	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;1
+$(CFG)\$(PLAT)\hb-view.exe: $(CFG)\$(PLAT)\harfbuzz.lib $(CFG)\$(PLAT)\util $(hb_view_OBJS)
+	link $(LDFLAGS) $(CFG)\$(PLAT)\harfbuzz.lib $(HB_UTILS_DEP_LIBS) -out:$@ @<<
+$(hb_view_OBJS)
+<<
+	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;1
+
+$(CFG)\$(PLAT)\hb-shape.exe: $(CFG)\$(PLAT)\harfbuzz.lib $(CFG)\$(PLAT)\util $(hb_shape_OBJS)
+	link $(LDFLAGS) $(CFG)\$(PLAT)\harfbuzz.lib $(HB_UTILS_DEP_LIBS) -out:$@ @<<
+$(hb_shape_OBJS)
+<<
+	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;1
+
+$(CFG)\$(PLAT)\hb-ot-shape-closure.exe: $(CFG)\$(PLAT)\harfbuzz.lib $(CFG)\$(PLAT)\util $(hb_ot_shape_closure_OBJS)
+	link $(LDFLAGS) $(CFG)\$(PLAT)\harfbuzz.lib $(HB_UTILS_DEP_LIBS) -out:$@ @<<
+$(hb_ot_shape_closure_OBJS)
+<<
+	@-if exist $@.manifest mt /manifest $@.manifest /outputresource:$@;1
+
+# Other .obj files requiring individual attention, that could not be covered by the inference rules.
+# Format is as follows (all dirs must have a trailing '\'):
+#
+# $(obj_file):
+# 	$(CC)|$(CXX) $(cflags) /Fo$(obj_destdir) /c @<<
+# $(srcfile)
+# <<
+$(CFG)\$(PLAT)\harfbuzz-gobject\hb-gobject-structs.obj:	$(CFG)\$(PLAT)\harfbuzz-gobject $(HB_GOBJECT_ENUM_GENERATED_SOURCES)
+	$(CXX) $(CFLAGS) $(HB_DEFINES) $(HB_LIB_CFLAGS) /I$(CFG)\$(PLAT)\harfbuzz-gobject /Fo$(CFG)\$(PLAT)\harfbuzz-gobject\ /c @<<
+..\src\hb-gobject-structs.cc
+<<
+
+$(CFG)\$(PLAT)\harfbuzz-gobject\hb-gobject-enums.obj: $(CFG)\$(PLAT)\harfbuzz-gobject $(HB_GOBJECT_ENUM_GENERATED_SOURCES)
+	$(CXX) $(CFLAGS) $(HB_DEFINES) $(HB_LIB_CFLAGS) /I$(CFG)\$(PLAT)\harfbuzz-gobject /Fo$(CFG)\$(PLAT)\harfbuzz-gobject\ /c @<<
+$(CFG)\$(PLAT)\harfbuzz-gobject\hb-gobject-enums.cc
+<<
+
+clean:
+	@-if exist $(CFG)\$(PLAT)\HarfBuzz-0.0.typelib del /f /q $(CFG)\$(PLAT)\HarfBuzz-0.0.typelib
+	@-if exist $(CFG)\$(PLAT)\HarfBuzz-0.0.gir del /f /q $(CFG)\$(PLAT)\HarfBuzz-0.0.gir
+	@-if exist $(CFG)\$(PLAT)\hb_list del /f /q $(CFG)\$(PLAT)\hb_list
+	@-del /f /q $(CFG)\$(PLAT)\*.pdb
+	@-if exist $(CFG)\$(PLAT)\.exe.manifest del /f /q $(CFG)\$(PLAT)\*.exe.manifest
+	@-if exist $(CFG)\$(PLAT)\.exe del /f /q $(CFG)\$(PLAT)\*.exe
+	@-del /f /q $(CFG)\$(PLAT)\*.dll.manifest
+	@-del /f /q $(CFG)\$(PLAT)\*.dll
+	@-del /f /q $(CFG)\$(PLAT)\*.ilk
+	@-del /f /q $(CFG)\$(PLAT)\*.obj
+	@-if exist $(CFG)\$(PLAT)\util del /f /q $(CFG)\$(PLAT)\util\*.obj
+	@-if exist $(CFG)\$(PLAT)\harfbuzz-gobject del /f /q $(CFG)\$(PLAT)\harfbuzz-gobject\*.obj
+	@-if exist $(CFG)\$(PLAT)\harfbuzz-icu del /f /q $(CFG)\$(PLAT)\harfbuzz-icu\*.obj
+	@-del /f /q $(CFG)\$(PLAT)\harfbuzz\*.obj
+	@-rmdir /s /q $(CFG)\$(PLAT)
+	@-if exist $(CFG)\$(PLAT)\harfbuzz-gobject\hb-gobject-enums.h del $(CFG)\$(PLAT)\harfbuzz-gobject\hb-gobject-enums.h
+	@-if exist $(CFG)\$(PLAT)\harfbuzz-gobject\hb-gobject-enums.cc del $(CFG)\$(PLAT)\harfbuzz-gobject\hb-gobject-enums.cc
+	@-del vc$(VSVER)0.pdb
+	@-del config.h