Ignore target files
Build scripts for Win32, OSX, iOS and android
JIT disabled on iOS, therefore *AsmJS* is undefined.
Don't use optimized ARM assembly code when using clang
Bug 911893 - cannot use --enable-android-libstdcxx configure option.r=glandium
https://github.com/mozilla/mozilla-central/commit/c677e52d750641ccf6ec18f6d4af35ab672ce292