[coretext] Compare CGFont and PS name, if CTFont didn't match

See comments.

Fixes vertical text.  CoreText backend is in very good shape now!

Also see:
5a0eed3b50629be4826e4e9428f2c3255195395d
25f4fb9b56bb3f8bec821571c78f8829e40daa54

Fixes http://github.com/behdad/harfbuzz/pull/36
1 file changed