Add HB_DEPRECATED_FOR and mark relevant symbols

src/hb-graphite2.h

diff --git a/src/hb-graphite2.h b/src/hb-graphite2.h
index acf1dfa..1720191 100644
--- a/src/hb-graphite2.h
+++ b/src/hb-graphite2.h
@@ -41,7 +41,7 @@
 
 #ifndef HB_DISABLE_DEPRECATED
 
-HB_EXTERN HB_DEPRECATED gr_font *
+HB_EXTERN HB_DEPRECATED_FOR (hb_graphite2_face_get_gr_face) gr_font *
 hb_graphite2_font_get_gr_font (hb_font_t *font);
 
 #endif