Add better support for armv7a cross compilation #2967

Job	Run time
cabal	26s
build-extra-hackages	29s
cabal-doExactConfig	1m 5s
check-materialization-concurrency	19s
closure-size	3s
check-path-support	9s
docs	48s
haskell-nix-roots-do-not-require-IFDs	18s
hix	56s
hix-cabal	9s
hydra-ifdLevel-0-and-1	5m 26s
hydra-ifdLevel-2	6m 43s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc9101	38s
hydra-without-remote-builders-ghc966	2m 50s
multi-target	3m 2s
maintainer-scripts	8s
nix-build	15m 56s
nix-tools	49s
plan-extra-hackages	20s
shellFor-hoogle	12s
runghc	8s
shellFor-multiple-package	15s
shellFor-not-depends	33s
shellFor-single-package	17s
tests-benchmarks	8s
unit-tests	23s
update-docs	4s
	1h 12m 44s

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