Bug 1054934

Hi, if you really want to add a __CONFIG_FOO__, please follow the AOSP way. See https://github.com/mozilla-b2g/platform_external_qemu/blob/master/android-configure.sh, https://github.com/mozilla-b2g/platform_external_qemu/blob/master/android/config/darwin-x86/config-host.h, and an example in https://github.com/mozilla-b2g/platform_external_qemu/commit/5c6a3426c7a6b2118d61e1afd6ac3db9c4913f5a .