Ensure that Tor builds on MacOS for ARM

With the arrival of the new MacOS release for ARM, we should make sure that Tor builds for the MacOS ARM target. It should be possible to cross-compile Tor from MacOS on x86-64 to ARM.

Best way to get this running right now is via the build-system of Tor.framework.

Benjamin from the Guardian Project says that Tor.framework currently does not work for the cross-compile target for MacOS ARM.

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