build

[common] time: improve flow with compiler hints #2413

Job	Run time
docs	35s
host-windows-cross	47s
host-linux	33s
client (gcc, g++, xdg-shell, Release)	46s
client (gcc, g++, xdg-shell, Debug)	51s
host-windows-native	1m 37s
module	28s
client (gcc, g++, libdecor, Release)	1m 5s
obs (gcc)	24s
client (gcc, g++, libdecor, Debug)	51s
obs (clang)	27s
client (clang, clang++, xdg-shell, Release)	1m 26s
client (clang, clang++, xdg-shell, Debug)	52s
client (clang, clang++, libdecor, Release)	1m 1s
client (clang, clang++, libdecor, Debug)	47s
	12m 30s

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