Add better support for armv7a cross compilation #2866

Job	Run time
cabal-doExactConfig	22s
build-extra-hackages	7s
cabal	37s
check-materialization-concurrency	20s
check-path-support	5s
docs	36s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	19s
hix	1m 9s
hix-cabal	9s
hydra-ifdLevel-0-and-1	5m 6s
hydra-ifdLevel-2	5m 36s
hydra-ifdLevel-3	30m 11s
hydra-without-remote-builders-ghc9101	2m 2s
hydra-without-remote-builders-ghc8107	30s
maintainer-scripts	7s
multi-target	35s
nix-tools	11s
nix-build	40s
runghc	10s
plan-extra-hackages	5s
shellFor-hoogle	8s
shellFor-multiple-package	11s
shellFor-not-depends	12s
shellFor-single-package	15s
tests-benchmarks	7s
unit-tests	4s
update-docs	11s
	50m 8s

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