[Bug #18879] Fix macOS version detections
macOS's AvailabilityMacros.h does not contain macros for future versions. If a version macro is not defined, consider only earlier versions to be targeted.
[Bug #18879] Fix macOS version detections
macOS's AvailabilityMacros.h does not contain macros for future
versions. If a version macro is not defined, consider only earlier
versions to be targeted.