Update Travis CI for now so it doesn't try to cross compile this branch

The other branches should cross compile fine.  Revert this change once
ioquake3 adds vorbis or else when OpenArena merges it from a branch.

.travis.yml

@@ -2,8 +2,10 @@ language: c
 compiler:
   - gcc
   - clang
-  - i686-w64-mingw32-gcc
-  - x86_64-w64-mingw32-gcc
+# These fail because ioquake3 is missing vorbis
+# Re-enable after they add vorbis or OA imports it
+#  - i686-w64-mingw32-gcc
+#  - x86_64-w64-mingw32-gcc
 
 script: ./travis-ci-build.sh