[host] d12: general cleanups #2448

Job	Run time
host-linux	22s
docs	35s
client (gcc, g++, xdg-shell, Release)	1m 1s
host-windows-cross	47s
client (gcc, g++, xdg-shell, Debug)	1m 10s
module	25s
host-windows-native	1m 25s
client (gcc, g++, libdecor, Release)	50s
client (gcc, g++, libdecor, Debug)	59s
obs (gcc)	37s
client (clang, clang++, xdg-shell, Release)	1m 10s
obs (clang)	31s
client (clang, clang++, xdg-shell, Debug)	59s
client (clang, clang++, libdecor, Release)	1m 6s
client (clang, clang++, libdecor, Debug)	1m 4s
	13m 1s

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