make libass use sub_font_name whenever it's possible
make libass use sub_font_name whenever it's possible



git-svn-id: 947b4ff483bb4cc5004120385d99e48ac0944466@25420 b3059339-0415-0410-9bf9-f77b7e298cf2

astiob/libass,mwgoldsmith/libass,rhlee/libass,mwgoldsmith/libass,blinkseb/libass,vault/libass,MrSmile/libass,sanyaade-g2g-repos/libass,tgoyne/libass,blinkseb/libass,Akemi/libass,asimonov-im/libass,sanyaade-g2g-repos/libass,torque/libass,sanyaade-g2g-repos/libass,ShiftMediaProject/libass,pigoz/libass-ct,tgoyne/libass,ShiftMediaProject/libass,libass/libass,torque/libass,Distrotech/libass,stps/libass,richardpl/libass,xbmc/libass,pigoz/libass-ct,pigoz/libass-ct,richardpl/libass,stps/libass,MrSmile/libass,grigorig/libass,Distrotech/libass,vault/libass,Distrotech/libass,rhlee/libass,libass/libass,grigorig/libass,xbmc/libass,richardpl/libass,torque/libass,astiob/libass,rhlee/libass,Akemi/libass,stps/libass,blinkseb/libass,tgoyne/libass,asimonov-im/libass,Akemi/libass,mwgoldsmith/libass