Run the testsuite on macos

[MLopez-Ibanez]

See:

testsuite/.github/workflows/moocore.yml

Lines 34 to 38 in 2e1728f

	# FIXME: needs
	# * brew install xz
	# * fix options only available in GNU diff
	#- { os: macos-13, cc: clang, python-version: '3.10' }
	#- { os: macos-14, cc: clang, python-version: '3.10' }