[build-script] Don't build stdlib for iOS if --skip-build-ios is passed #27840
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When
--skip-build-ios
is passed, we should not build anything that is iOS related. This includes the standard library. However, we have so far been ignoring the flag for the standard library builds. This PR fixes this. The same also applies for watchOS and tvOS.Disclaimer: I am not quite sure if this will break some bots that relied on the standard library being there. If any break, we should go and update the presets or revert this PR.