autobuild: Enable Ogg Vorbis, Freetype, and MDR model support

Removed unneeded SDL packages.
Merge remote-tracking branch 'upstream/master'
Update .travis.yml for Spearmint

vorbis and freetype are included in local source tree and enabled by default.
autobuild: test default build, with extra options, and mingw
autobuild: try to fix extra options build and mingw builds
Fix RAVENMD4 warnings in OpenGL2
Improve build-test.sh for non-travis-ci usage
Merge remote-tracking branch 'upstream/master'

Conflicts:
	.travis.yml
build-test.sh always run clean first, for non-travis-ci
Merge remote-tracking branch 'upstream/master'
These options default to enabled in Spearmint anyway
Move MC_UnCompress to tr_model.c to fix dedicated server with RAVENMD4

Fixing compiling model loading into dedicated server with RAVENMD4 defined.
This only needed to be done to gl1, but made gl2 match just for consistancy.
Remove a blank line, related to last commit
Fix dedicated with qgl.h included multiple times
Fix last commit
Merge remote-tracking branch 'upstream/master'

Conflicts:
	code/renderergl1/tr_local.h
	code/renderergl1/tr_model.c
Update IRC channel for travis-ci