* Update freedoom to 0.8beta1
* Update build to the latest standards
* Patch cmus for a segfault

	new file:   audio/cmus/cmus-v2.5.0-cmdsegfault.patch.xz
	modified:   audio/cmus/cmus.build
	renamed:    games/freedoom/freedoom-iwad-0.7-desktop.patch.xz -> games/freedoom/freedoom-iwad-0.8-beta1-desktop.patch.xz
	modified:   games/freedoom/freedoom.build
	new file:   games/freedoom/prboom-plus-2.5.1.3-docdir.patch.xz