games/scummvm: Update to 2.5.0

* Version 2.4 was skipped because this is the first release that
  supports 2.5D games (almost 3D), thanks to the merge with ResidualVM.

* Fold the A52, MP3, PNG and VORBIS options because their dependencies
  are now required to provide the full set of stable engines.

* Remove now obsolete patch from 05a45a5e.

Changelog:

https://downloads.scummvm.org/frs/scummvm/2.5.0/ReleaseNotes.html

MFH:		No (feature release)