CMake

fixup! fixup! Add Emscripten builds #29

Job	Run time
emscripten (Debug)	1m 21s
build (windows-2022, x64-windows, windows.x64, https://broth.itch.ovh/butler/windows-amd64/LATEST...	4m 52s
build (macos-14, arm64-osx, macos.arm64, https://broth.itch.ovh/butler/darwin-amd64/LATEST/archiv...	1m 20s
emscripten (Release)	1m 31s
build (ubuntu-24.04, x64-linux, linux.x64, https://broth.itch.ovh/butler/linux-amd64/LATEST/archi...	1m 23s
	10m 27s

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