libass: Fix static library
libass: Fix static library

By defining FRIBIDI_LIB_STATIC for static build libass.a imports fribidi without dllimport.
fabiangreffrath/MINGW-packages,JPeterMugaas/MINGW-packages,oscarfv/MINGW-packages,fabiangreffrath/MINGW-packages,Alexpux/MINGW-packages,oroppas/MINGW-packages,fabiangreffrath/MINGW-packages,JPeterMugaas/MINGW-packages,JPeterMugaas/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,oscarfv/MINGW-packages,Alexpux/MINGW-packages,oroppas/MINGW-packages,lhmouse/MINGW-packages,stahta01/MINGW-packages,JPeterMugaas/MINGW-packages,oscarfv/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,oroppas/MINGW-packages,oscarfv/MINGW-packages,oroppas/MINGW-packages,stahta01/MINGW-packages,oscarfv/MINGW-packages,fabiangreffrath/MINGW-packages,oscarfv/MINGW-packages,stahta01/MINGW-packages,Alexpux/MINGW-packages,lhmouse/MINGW-packages,stahta01/MINGW-packages,oroppas/MINGW-packages,Alexpux/MINGW-packages,lhmouse/MINGW-packages,JPeterMugaas/MINGW-packages,oroppas/MINGW-packages,fabiangreffrath/MINGW-packages,Alexpux/MINGW-packages,lhmouse/MINGW-packages,JPeterMugaas/MINGW-packages,Alexpux/MINGW-packages,fabiangreffrath/MINGW-packages