Add better support for armv7a cross compilation #2606

Job	Run time
build-extra-hackages	3s
cabal	4s
cabal-doExactConfig	3s
check-materialization-concurrency	3s
check-path-support	6s
closure-size	3s
docs	2m 54s
haskell-nix-roots-do-not-require-IFDs	7s
hix	16s
hix-cabal	3s
hydra-ifdLevel-0-and-1	7s
hydra-ifdLevel-2	3s
hydra-ifdLevel-3	6s
hydra-without-remote-builders-ghc8107	8s
hydra-without-remote-builders-ghc9101	2s
maintainer-scripts	3s
multi-target	3s
nix-build	3s
nix-tools	8s
plan-extra-hackages	3s
runghc	7s
shellFor-hoogle	7s
shellFor-multiple-package	7s
shellFor-not-depends	3s
shellFor-single-package	4s
tests-benchmarks	4s
unit-tests	4s
update-docs	6s
	5m 10s

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