OSX: Use MAC_OS_X_VERSION_MAX_ALLOWED to infer SDK compiled with.
OSX: Use MAC_OS_X_VERSION_MAX_ALLOWED to infer SDK compiled with.

Signed-off-by: Vassil Vassilev <0b291c0bdb4e22c8b7705ceedf8e168ff73f20e8@cern.ch>

root-mirror/cling,marsupial/cling,root-mirror/cling,marsupial/cling,root-mirror/cling,marsupial/cling,root-mirror/cling,karies/cling,marsupial/cling,karies/cling,karies/cling,marsupial/cling,root-mirror/cling,root-mirror/cling,marsupial/cling,karies/cling,karies/cling,karies/cling