Fix build on OS X. Previously, building on OS X always assumed to be on an iDevice.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12090 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=283f7b32741d5831cccfd47012da05ea296d6463
Add Travis-CI integration for Xonotic.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12091 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=d2e14a4b7c95b0cd90fe509c2127e9fd0ce65eee