build

[host] d12: add wrappers for backend functions #2446

Job	Run time
host-windows-cross	45s
docs	1m 13s
client (gcc, g++, xdg-shell, Release)	2m 1s
client (gcc, g++, xdg-shell, Debug)	59s
host-linux	22s
host-windows-native	1m 30s
module	42s
client (gcc, g++, libdecor, Release)	1m 15s
client (gcc, g++, libdecor, Debug)	49s
obs (gcc)	31s
client (clang, clang++, xdg-shell, Release)	1m 3s
obs (clang)	26s
client (clang, clang++, xdg-shell, Debug)	48s
client (clang, clang++, libdecor, Release)	1m 13s
client (clang, clang++, libdecor, Debug)	57s
	14m 34s

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