Add support for ARM in CheckTypeSize
Now that iphone's are kind of a thing, arm support really should be added into CheckTypeSize.
Otherwise CMake will (intentionally) fail for any project if both armv7(s) and arm64 is set in CMAKE_OSX_ARCHITECTURES.
This should just be a matter of extending the current detection code as such: osx_architectures_arm.patch
Though I'm not sure if there is any benefit to treating armv7 and armv7s separately. They should be abi compatible and would both be covered by testing for __arm__
.