Add better support for armv7a cross compilation #2952

Job	Run time
cabal	21s
build-extra-hackages	14s
cabal-doExactConfig	19s
check-materialization-concurrency	20s
check-path-support	9s
closure-size	3s
docs	1m 42s
haskell-nix-roots-do-not-require-IFDs	1m 4s
hix	51s
hix-cabal	3m 45s
hydra-ifdLevel-0-and-1	5m 51s
hydra-ifdLevel-2	9m 25s
hydra-ifdLevel-3	30m 12s
hydra-without-remote-builders-ghc9101	5m 14s
hydra-without-remote-builders-ghc966	2m 28s
multi-target	44s
nix-build	13m 13s
maintainer-scripts	11s
nix-tools	12s
plan-extra-hackages	9s
runghc	8s
shellFor-hoogle	13s
shellFor-multiple-package	19s
shellFor-not-depends	17s
shellFor-single-package	17s
tests-benchmarks	10s
unit-tests	14s
update-docs	4s
	1h 18m 9s

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