CMake

Update subproject commit in extern/semitone #353

Job	Run time
build (ubuntu-latest, Debug, ON, ON)	52m 30s
build (ubuntu-latest, Debug, ON, OFF)	2h 32m 12s
build (ubuntu-latest, Debug, OFF, ON)	52m 43s
build (ubuntu-latest, Debug, OFF, OFF)	2h 32m 25s
build (ubuntu-latest, Release, ON, ON)	26m 44s
build (ubuntu-latest, Release, ON, OFF)	1h 16m 23s
build (ubuntu-latest, Release, OFF, ON)	26m 28s
build (ubuntu-latest, Release, OFF, OFF)	1h 16m 32s
build (windows-latest, Debug, ON, ON)	51m 56s
build (windows-latest, Debug, ON, OFF)	1h 42m 5s
build (windows-latest, Debug, OFF, ON)	51m 55s
build (windows-latest, Debug, OFF, OFF)	1h 41m 56s
build (windows-latest, Release, ON, ON)	27m 20s
build (windows-latest, Release, ON, OFF)	1h 17m 7s
build (windows-latest, Release, OFF, ON)	27m 3s
build (windows-latest, Release, OFF, OFF)	1h 16m 55s
build (macos-latest, Debug, ON, ON)	26m 12s
build (macos-latest, Debug, ON, OFF)	1h 16m 21s
build (macos-latest, Debug, OFF, ON)	26m 6s
build (macos-latest, Debug, OFF, OFF)	1h 16m 23s
build (macos-latest, Release, ON, ON)	26m 16s
build (macos-latest, Release, ON, OFF)	1h 16m 43s
build (macos-latest, Release, OFF, ON)	26m 15s
build (macos-latest, Release, OFF, OFF)	1h 16m 13s
	1d 1h 42m 43s

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