lookup prefers earlier opened fonts.
This way glyph lookup is stable, which means that:
- cache cleanup is never required after font reselecting;
- a single unrecognized char won't change the appearance of all the others.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21635 b3059339-0415-0410-9bf9-f77b7e298cf2