Add hb_gdi_face_create API

Based on Konstantin Ritt work posted on mailing list

docs/harfbuzz-sections.txt

diff --git a/docs/harfbuzz-sections.txt b/docs/harfbuzz-sections.txt
index f23dcd1..43fd761 100644
--- a/docs/harfbuzz-sections.txt
+++ b/docs/harfbuzz-sections.txt
@@ -370,6 +370,11 @@
 </SECTION>
 
 <SECTION>
+<FILE>hb-gdi</FILE>
+hb_gdi_face_create
+</SECTION>
+
+<SECTION>
 <FILE>hb-glib</FILE>
 hb_glib_get_unicode_funcs
 hb_glib_script_from_script