Summary: When building for Mac Catalyst, it mostly appears as if it's targeting iOS (`TARGET_OS_OSX` is `0`) and the behavior should be aligned with iOS Simulator builds.
Reviewed By: lblasa
Differential Revision: D34413681
fbshipit-source-id: 1e56bbb3f16f8cd78e77771ff641c5cfcbc49955
c15605afd3