Add graphite2 integration from Martin Hosken

To be modified, a lot.
diff --git a/src/Makefile.am b/src/Makefile.am
index 0b20709..95980a2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -116,6 +116,13 @@
 HBHEADERS += hb-ft.h
 endif
 
+if HAVE_GRAPHITE
+HBCFLAGS += $(GRAPHITE_CFLAGS)
+HBLIBS   += $(GRAPHITE_LIBS)
+HBSOURCES += hb-graphite2.cc
+HBHEADERS += hb-graphite2.h
+endif
+
 if HAVE_UNISCRIBE
 HBCFLAGS += $(UNISCRIBE_CFLAGS)
 HBLIBS   += $(UNISCRIBE_LIBS)