Install: permit ARM-based Macs

[mistydemeo]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

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ARM Macs exist now! We need to permit those too.

[sjackman]

Please remove this Linux-specific function:

brew/Library/Homebrew/extend/os/linux/install.rb

Lines 18 to 29 in a2d4114

	def check_cpu
	return if (Hardware::CPU.intel? && Hardware::CPU.is_64_bit?) || Hardware::CPU.arm?
	message = "Sorry, Homebrew does not support your computer's CPU architecture!"
	if Hardware::CPU.ppc64le?
	message += <<~EOS
	For OpenPOWER Linux (PPC64LE) support, see:
	#{Formatter.url("https://github.com/homebrew-ppc64le/brew")}
	EOS
	end
	abort message
	end

[mistydemeo]

The Linux specific function has different messaging. If I delete it, it will point PPC64 Linux users at Tigerbrew instead.

[sjackman]

The Linux specific function has different messaging. If I delete it, it will point PPC64 Linux users at Tigerbrew instead.

Woops! I missed that.