Besides use of --universal with --osxtarget 11, it's now also possible to create a fat build with ARM64 by using --osxtarget 10.9 --arch x86_64 --arch arm64 (it will use the 11.x SDK but target 10.9)
FMOD Ex is also being disabled when building against the 10.14 SDK or higher, because the necessary libstdc++.6.0.9.dylib is no longer being shipped. FMOD Ex, libRocket and Cg are all disabled on ARM64 (FMOD Ex and Cg don't have the binaries available, libRocket could theoretically be built but there's no point as there won't be an ARM64 build of Python 2.7, and besides, we've deprecated it anyway).
Fixes#1062
a18edf54b7
