Add better support for armv7a cross compilation #2970

Job	Run time
cabal	34s
multi-target	48s
cabal-doExactConfig	27s
nix-build	2m 13s
runghc	25s
tests-benchmarks	22s
unit-tests	5s
build-extra-hackages	7s
docs	2m 1s
hix	1m 4s
plan-extra-hackages	5s
maintainer-scripts	10s
shellFor-hoogle	50s
shellFor-multiple-package	13s
shellFor-not-depends	23s
shellFor-single-package	48s
check-materialization-concurrency	23s
check-path-support	9s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	16s
hydra-ifdLevel-2	3m 22s
hydra-ifdLevel-0-and-1	3m 9s
update-docs	4s
hydra-ifdLevel-3	29m 55s
hix-cabal	10s
hydra-without-remote-builders-ghc9101	2m 36s
hydra-without-remote-builders-ghc966	1m 58s
nix-tools	42s
	53m 22s

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