Add test for cross compilation of gi-gtk #2456

Job	Run time
cabal	28s
cabal-doExactConfig	22s
multi-target	47s
runghc	20s
nix-build	1m 27s
shellFor-single-package	30s
tests-benchmarks	36s
unit-tests	9s
build-extra-hackages	10s
docs	43s
hix	46s
hydra-ifdLevel-0-and-1	33s
hydra-ifdLevel-2	18s
hydra-ifdLevel-3-and-ghc-8-10	23s
maintainer-scripts	10s
plan-extra-hackages	10s
shellFor-hoogle	12s
shellFor-multiple-package	17s
shellFor-not-depends	18s
check-materialization-concurrency	19s
check-path-support	6s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	4s
hix-cabal	10s
hydra-ifdLevel-3-and-ghc-9-2	18s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	18s
hydra-without-remote-builders-ghc8107	1m 25s
hydra-without-remote-builders-ghc9101	1m 6s
nix-tools	9s
update-docs	4s
	12m 41s

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