Font metrics: FreeType falls back to sTypoAscender/Descender
Font metrics: FreeType falls back to sTypoAscender/Descender

Fixes libass#8.

sanyaade-g2g-repos/libass,MrSmile/libass,ShiftMediaProject/libass,stps/libass,sanyaade-g2g-repos/libass,MrSmile/libass,mwgoldsmith/libass,stps/libass,stps/libass,mwgoldsmith/libass,grigorig/libass,mwgoldsmith/libass,libass/libass,torque/libass,pigoz/libass-ct,grigorig/libass,ShiftMediaProject/libass,xbmc/libass,pigoz/libass-ct,sanyaade-g2g-repos/libass,Akemi/libass,xbmc/libass,astiob/libass,Akemi/libass,torque/libass,torque/libass,astiob/libass,libass/libass,pigoz/libass-ct,Akemi/libass