libusb/Makefile.am: Fix out-of-tree builds on Windows

The prerequisite $< includes the path when not building in-tree, thus
the use of $(srcdir) as a prefix is incorrect.

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>

libusb/Makefile.am

diff --git a/libusb/Makefile.am b/libusb/Makefile.am
index b8936a5..2942219 100644
--- a/libusb/Makefile.am
+++ b/libusb/Makefile.am
@@ -93,7 +93,7 @@
 all-local: .libs/libusb-1.0.dll.a
 # Rebuild the import lib from the .def so that MS and MinGW DLLs can be interchanged
 .libs/libusb-1.0.dll.a: libusb-1.0.def libusb-1.0.la
-	$(AM_V_GEN)$(DLLTOOL) $(DLLTOOLFLAGS) --kill-at --input-def $(srcdir)/$< --dllname libusb-1.0.dll --output-lib $@
+	$(AM_V_GEN)$(DLLTOOL) $(DLLTOOLFLAGS) --kill-at --input-def $< --dllname libusb-1.0.dll --output-lib $@
 endif
 endif
 

libusb/version_nano.h

diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index a4419ee..09a9295 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11471
+#define LIBUSB_NANO 11472