Add better support for armv7a cross compilation #2921

Job	Run time
build-extra-hackages	11s
cabal-doExactConfig	10s
cabal	10s
check-path-support	10s
closure-size	3s
check-materialization-concurrency	23s
docs	24s
haskell-nix-roots-do-not-require-IFDs	13s
hix	32s
hix-cabal	7s
hydra-ifdLevel-0-and-1	3m 45s
hydra-ifdLevel-2	4m 5s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9101	2m 38s
hydra-without-remote-builders-ghc966	32s
maintainer-scripts	11s
multi-target	35s
nix-build	12m 48s
nix-tools	1m 53s
plan-extra-hackages	6s
runghc	8s
shellFor-hoogle	10s
shellFor-multiple-package	26s
shellFor-not-depends	15s
shellFor-single-package	17s
tests-benchmarks	8s
unit-tests	5s
update-docs	3s
	1h 0m 44s

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