allow user to put their own includes...

useful on OpenBSD since $(FREETYPE) refers to freetype2, hence *no* t1lib.h.
and we traditionally get this through /usr/local/include anyways...

svn path=/trunk/kdegraphics/kpdf/; revision=354667

splash/Makefile.am

@@ -1,4 +1,4 @@
-INCLUDES = -I$(srcdir)/.. -I$(srcdir)/../fofi -I$(srcdir)/../goo $(LIBFREETYPE_CFLAGS)
+INCLUDES = -I$(srcdir)/.. -I$(srcdir)/../fofi -I$(srcdir)/../goo $(LIBFREETYPE_CFLAGS) $(USER_INCLUDES)
 
 libsplash_la_SOURCES = Splash.cc SplashBitmap.cc SplashClip.cc SplashFTFont.cc SplashFTFontEngine.cc \
 	SplashFTFontFile.cc SplashFont.cc SplashFontEngine.cc SplashFontFile.cc SplashFontFileID.cc \