[embedded] Make stdlib APIs automatically available on older Darwin versions in Embedded Swift #78263
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The motivation here is about using types and API that have been recently added to the stdlib with an availability only in a recent macOS release (for regular Swift) because the stdlib ships as part of the OS. However, we don't have that constraint with Embedded Swift where the stdlib/runtime is statically included into the produced binaries, and therefore we should be able to use such stdlib types regardless of the "official" availability for regular Swift.