md(4|5): don't use deprecated iOS functions #11102
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Also, use
*_MIN_REQUIRED
instead of*_MIN_ALLOWED
to check for the minimum macOS and iOS versions. There are other open source projects checking for__MAC_OS_X_VERSION_MIN_ALLOWED
too, but__MAC_OS_X_VERSION_MIN_REQUIRED
and__IPHONE_OS_VERSION_MIN_REQUIRED
seems to be what's currently defined in Apple's AvailabilityInternal.h.