Add include of FT_SYNTHESIS_H

In older versions of Freetype, the FT_GlyphSlot_Own_Bitmap function is
defined in FT_SYNTHESIS_H. Modern versions have it in FT_BITMAP_H.

git-svn-id: http://skia.googlecode.com/svn/trunk@575 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed