Don't build FCollada with -Wno-unused-but-set-variable. (Causes clang to complain and breaks the build in older GGCs.)

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13798 3db68df2-c116-0410-a063-a993310a9797
fix music glitchyness when game loses focus trac #2090

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13799 3db68df2-c116-0410-a063-a993310a9797
Merge remote-tracking branch 'remotes/trunk'
Merge branch 'master' of http://github.com/JoshuaJB/0ad into lobby