allegro: update to 5.2.7.0
allegro: update to 5.2.7.0

* Enable demo and example programs.
* Install license file.
* Remove workaround for DS3DALG_DEFAULT constant.
stahta01/MINGW-packages,Alexpux/MINGW-packages,Alexpux/MINGW-packages,oscarfv/MINGW-packages,stahta01/MINGW-packages,oscarfv/MINGW-packages,oroppas/MINGW-packages,fabiangreffrath/MINGW-packages,oscarfv/MINGW-packages,oscarfv/MINGW-packages,fabiangreffrath/MINGW-packages,stahta01/MINGW-packages,oroppas/MINGW-packages,lhmouse/MINGW-packages,lhmouse/MINGW-packages,oroppas/MINGW-packages,oroppas/MINGW-packages,oscarfv/MINGW-packages,JPeterMugaas/MINGW-packages,fabiangreffrath/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,fabiangreffrath/MINGW-packages,JPeterMugaas/MINGW-packages,lhmouse/MINGW-packages,lhmouse/MINGW-packages,oroppas/MINGW-packages,Alexpux/MINGW-packages,JPeterMugaas/MINGW-packages,oroppas/MINGW-packages,JPeterMugaas/MINGW-packages,JPeterMugaas/MINGW-packages,Alexpux/MINGW-packages,Alexpux/MINGW-packages,fabiangreffrath/MINGW-packages,oscarfv/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,fabiangreffrath/MINGW-packages,JPeterMugaas/MINGW-packages,Alexpux/MINGW-packages,stahta01/MINGW-packages