Add test for cross compilation of gi-gtk #2455

Job	Run time
check-materialization-concurrency	28s
cabal	45s
cabal-doExactConfig	43s
build-extra-hackages	30s
check-path-support	28s
closure-size	14s
docs	1m 9s
haskell-nix-roots-do-not-require-IFDs	15s
hix	2m 2s
hix-cabal	20s
hydra-ifdLevel-0-and-1	1m 1s
hydra-ifdLevel-2	1m 25s
hydra-ifdLevel-3-and-ghc-8-10	45s
hydra-ifdLevel-3-and-ghc-9-2	1m 13s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	1m 6s
hydra-without-remote-builders-ghc8107	1m 45s
hydra-without-remote-builders-ghc9101	3m 23s
maintainer-scripts	24s
multi-target	1m 6s
nix-build	1m 5s
nix-tools	25s
plan-extra-hackages	27s
runghc	25s
shellFor-hoogle	26s
shellFor-multiple-package	31s
shellFor-not-depends	25s
shellFor-single-package	28s
tests-benchmarks	17s
unit-tests	17s
update-docs	6s
	23m 54s

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