Add better support for armv7a cross compilation #2977

Job	Run time
cabal	14s
cabal-doExactConfig	13s
nix-build	1m 11s
runghc	12s
tests-benchmarks	15s
build-extra-hackages	10s
unit-tests	6s
hix	19s
maintainer-scripts	6s
multi-target	35s
plan-extra-hackages	9s
shellFor-hoogle	11s
shellFor-multiple-package	14s
shellFor-not-depends	17s
shellFor-single-package	37s
check-materialization-concurrency	20s
check-path-support	20s
closure-size	3s
docs	42s
haskell-nix-roots-do-not-require-IFDs	17s
hix-cabal	3m 8s
hydra-ifdLevel-0-and-1	3m 39s
hydra-ifdLevel-2	4m 0s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc9101	42s
hydra-without-remote-builders-ghc966	20s
nix-tools	2m 24s
update-docs	8s
	51m 2s

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