Add better support for armv7a cross compilation #2974

Job	Run time
cabal	1m 48s
build-extra-hackages	32s
cabal-doExactConfig	1m 49s
check-materialization-concurrency	20s
check-path-support	1m 24s
closure-size	4s
docs	6m 37s
hix	5m 54s
haskell-nix-roots-do-not-require-IFDs	57m 56s
hydra-ifdLevel-0-and-1	7m 37s
hix-cabal	2m 23s
hydra-ifdLevel-2	11m 58s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc9101	3m 35s
hydra-without-remote-builders-ghc966	14s
maintainer-scripts	51s
multi-target	3m 47s
nix-build	1m 7s
nix-tools	12s
plan-extra-hackages	7s
runghc	11s
shellFor-hoogle	40s
shellFor-multiple-package	28s
shellFor-not-depends	15s
shellFor-single-package	19s
tests-benchmarks	11s
unit-tests	5s
update-docs	4s
	2h 20m 43s

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