[ft-devel] Failed to detect subset PMingLiU font embeded in PDF file

[JustFillBug]

Freetype try to auto detect PMingLiU font and force unpatented hinting
for rendering (ttobjs.c->tt_face_init). However, for embeded subset
fonts in pdf, it seems that the family name is not saved, instead, only
fontname is preserved. As shown at

<https://bugs.freedesktop.org/show_bug.cgi?id=15301>. 

As a result, pdf file with subset PMingLiU font would not be displayed
properly.