xamarin-android repo M1 build support

[Apple announced new Mac hardware][0], which use an [M1 CPU][1], which is an arm64-compatible ABI, *not* intel based.  Legacy software built for intel CPUs will still run via the [Rosetta][3] translation environment.

What about *building* the xamarin-android repo on an M1 CPU?

Currently, that fails:

	% make prepare PREPARE_AUTOPROVISION=true
	…
	  Error: Could not find Homebrew on this system, please install it from https://brew.sh/

Unfortunately, [Homebrew][4] won't install by default:

	% /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

	Password:
	Homebrew is not (yet) supported on ARM processors!
	Rerun the Homebrew installer under Rosetta 2.
	If you really know what you are doing and are prepared for a very broken
	experience you can use another installation option for installing on ARM:
	  https://docs.brew.sh/Installation


[0]: https://www.apple.com/newsroom/2020/11/introducing-the-next-generation-of-mac/
[1]: https://www.apple.com/newsroom/2020/11/apple-unleashes-m1/
[2]: https://www.apple.com/newsroom/2020/11/apple-unleashes-m1/
[3]: https://developer.apple.com/documentation/apple_silicon/about_the_rosetta_translation_environment
[4]: https://brew.sh


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xamarin-android repo M1 build support #5518

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xamarin-android repo M1 build support #5518

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