Back out 314ce3068d94 (bug 855389) for browser-chrome bustage
Bug 788613 - Dump config.log when configure fails. r=ted
Bug 857147 - Fixup Android DIST_FILES after bug 648407 and bug 852950. r=ted
Bug 857526 - Check webrtc target arch right after checking target OS, instead of after AC_OUTPUT, which is too late. r=ted
Bug 858393 - Avoid race condition creating directories in config.status. r=gps
Bug 858204 - Enable libevent logging on debug builds. r=jlebar