Tweak/remove stratagus optional depends

[AMDmi3]

Stratagus, being a flexible engine, has a set of build tunables for enabling optional dependencies such as mikmod, mng, theora etc. Wyrmgus, otoh, being a specialized engine doesn't need suck flexibility as a set of formats needed for wyrmsun is known. To simplify packaging, it's be nice to either switch options corresponding to unneeded components to off or remove them along with specific dependency handling completely.

[Andrettin]

I see what you mean, but the idea is to keep Wyrmgus as flexible as Stratagus, and to make changes only where necessary to add features to Wyrmsun, to make it easier to port Wyrmgus code back to mainline Stratagus.

[AMDmi3]

Ok, then what optional depends are needed for wyrmsun? I've disabled practically everything and the game works fine. However my guess is that at least vorbis should be enabled for music support.

PS. Tweaking default option values should not induce huge divergency with stratagus. If renaming binary is tolerable, so should be this.

[Andrettin]

Pretty much only Vorbis should be necessary for Wyrmsun IIRC.

You are right that tweaking default option values would not create significant divergence with Stratagus, but I prefer to compile Wyrmgus with those settings on, as they can be useful to modders.

[AMDmi3]

Point taken, thank you.