gcc@11 11.3.0 (new formula)

[carlocab]

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Split out from #106755.

Tap syntax tests will probably fail until #106755 is merged.

[carlocab]

Suggested change

	sdk = MacOS.sdk_path_if_needed
	if sdk
	args << "--with-native-system-header-dir=/usr/include"
	args << "--with-sysroot=#{sdk}"
	end
	sdk = MacOS.sdk_path_if_needed
	args << "--with-sysroot=#{sdk}" if sdk

Right, @fxcoudert?

[BrewTestBot]

@carlocab has triggered a merge.