Add `__isPlatformOrVariantPlatformVersionAtLeast()` which is used to check OS version availability from zippered libraries on macOS. This routine is needed for complete macCatalyst support in the Swift compiler.
Add `__isPlatformOrVariantPlatformVersionAtLeast()` which is used to check OS version availability from zippered libraries on macOS. This routine is needed for complete macCatalyst support in the Swift compiler.