[common] option: send all output to stderr #2471

Job	Run time
host-windows-cross	1m 26s
host-linux	53s
docs	47s
client (gcc, g++, xdg-shell, Release)	1m 9s
host-windows-native	1m 32s
client (gcc, g++, xdg-shell, Debug)	1m 18s
module	41s
obs (gcc)	1m 3s
client (gcc, g++, libdecor, Release)	1m 8s
obs (clang)	31s
client (gcc, g++, libdecor, Debug)	1m 22s
client (clang, clang++, xdg-shell, Release)	1m 5s
client (clang, clang++, xdg-shell, Debug)	1m 25s
client (clang, clang++, libdecor, Release)	1m 49s
client (clang, clang++, libdecor, Debug)	1m 5s
	17m 14s

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