gate the build with target_os = "macos"#506

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alexanderkjall wants to merge 2 commits intoservo:mainfrom alexanderkjall:build-on-non-macos

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Commits on Apr 19, 2022

gate the build with target_os = "macos" so that we don't get build errors on linux
alexanderkjall
committed

Commits on Apr 23, 2022

allow compilation on any of macos, ios, tvos or watchos
alexanderkjall
committed