Add better support for armv7a cross compilation #2968

Job	Run time
build-extra-hackages	37s
cabal	2m 44s
check-path-support	6s
cabal-doExactConfig	37s
check-materialization-concurrency	20s
closure-size	4s
hix	41s
haskell-nix-roots-do-not-require-IFDs	18s
hix-cabal	3m 9s
docs	19m 31s
hydra-ifdLevel-0-and-1	3m 49s
hydra-ifdLevel-2	4m 4s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc9101	3m 47s
hydra-without-remote-builders-ghc966	6m 23s
maintainer-scripts	20s
multi-target	7m 3s
nix-build	40s
nix-tools	12s
plan-extra-hackages	29s
runghc	13s
shellFor-hoogle	11s
shellFor-multiple-package	17s
shellFor-not-depends	15s
shellFor-single-package	17s
tests-benchmarks	7s
unit-tests	5s
update-docs	8s
	1h 26m 42s

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