Add better support for armv7a cross compilation #2823

Job	Run time
cabal	11s
build-extra-hackages	6s
check-materialization-concurrency	22s
check-path-support	4m 46s
cabal-doExactConfig	11s
closure-size	8s
docs	3m 14s
haskell-nix-roots-do-not-require-IFDs	3m 13s
hix	40s
hix-cabal	8s
hydra-ifdLevel-0-and-1	4m 49s
hydra-ifdLevel-2	5m 2s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc8107	2m 30s
hydra-without-remote-builders-ghc9101	2m 15s
maintainer-scripts	11s
multi-target	38s
nix-build	40m 58s
nix-tools	24s
plan-extra-hackages	6s
runghc	7s
shellFor-hoogle	8s
shellFor-multiple-package	27m 19s
shellFor-single-package	16s
tests-benchmarks	7s
shellFor-not-depends	14s
unit-tests	9s
update-docs	7s
	2h 8m 34s

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