Use correct values for MAC_OS_X_VERSION_10_* defines.

Change-Id: I1951fd6447a3d9d20feea99408174d4993a81f5c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
fix compilation errors with OS X 10.7 SDK or later for the Carbon flavor

Some deprecated functions have been removed from the the 10.7 SDK, but
the symbols are still exported by the 32-bit libraries.

Change-Id: I5e7843db02f9fdb6288425ce32574b43087958ce
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>