Free a provider's fonts when it is freed
Free a provider's fonts when it is freed

When a provider is freed, iterate the font database, free all fonts
that belong to that provider and compact the database afterwards.

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