Add better support for armv7a cross compilation #2981

Job	Run time
nix-build	1m 40s
runghc	15s
unit-tests	9s
cabal	17s
cabal-doExactConfig	29s
multi-target	1m 11s
shellFor-multiple-package	26s
shellFor-single-package	28s
tests-benchmarks	25s
build-extra-hackages	15s
closure-size	9s
docs	54s
hix	1m 14s
hydra-ifdLevel-0-and-1	7m 11s
hydra-ifdLevel-2	20m 10s
hydra-ifdLevel-3	30m 9s
maintainer-scripts	22s
plan-extra-hackages	13s
shellFor-hoogle	25s
shellFor-not-depends	43s
check-materialization-concurrency	25s
check-path-support	9s
haskell-nix-roots-do-not-require-IFDs	22s
hix-cabal	11s
hydra-without-remote-builders-ghc9101	1m 7s
nix-tools	21s
update-docs	7s
hydra-without-remote-builders-ghc966	50s
	1h 10m 37s

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