mac 10.15 is the best I can do #156

Job	Run time
release (macos, -intel, x86_64, macos-universal, 12, ./.github/workflows/scripts/mac/scons-build....	4m 26s
release (macos, -intel, x86_64, macos-universal, 12, ./.github/workflows/scripts/mac/scons-build....	4m 55s
release (macos, arm64, -silicon, macos-universal, 14, ./.github/workflows/scripts/mac/scons-build...	5m 28s
release (macos, arm64, -silicon, macos-universal, 14, ./.github/workflows/scripts/mac/scons-build...	4m 17s
release (ubuntu, 22.04, scons, Release)	39s
release (ubuntu, 22.04, scons, Debug)	36s
release (windows, 2019, ./.github/workflows/scripts/win/scons-build.bat, Release)	1m 26s
release (windows, 2019, ./.github/workflows/scripts/win/scons-build.bat, Debug)	1m 5s
	22m 52s

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