Match macos_extension flags to flags used in Xcode12.5 extension templates
Match macos_extension flags to flags used in Xcode12.5 extension templates

PiperOrigin-RevId: 376219043
(cherry picked from commit 9475887357959541115133e264939b6756d23367)

bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple