Add better support for armv7a cross compilation #2973

Job	Run time
cabal	2m 48s
cabal-doExactConfig	2m 49s
build-extra-hackages	1m 12s
check-materialization-concurrency	20s
check-path-support	1m 48s
docs	20m 4s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	1m 5s
hix	3m 39s
hix-cabal	51s
hydra-ifdLevel-0-and-1	4m 32s
hydra-ifdLevel-2	12m 39s
hydra-ifdLevel-3	30m 11s
hydra-without-remote-builders-ghc9101	8m 46s
hydra-without-remote-builders-ghc966	7m 18s
maintainer-scripts	20s
multi-target	7m 16s
nix-build	6m 2s
nix-tools	12s
plan-extra-hackages	1m 44s
runghc	45s
shellFor-hoogle	54s
shellFor-not-depends	16s
shellFor-single-package	1m 48s
shellFor-multiple-package	15s
tests-benchmarks	8s
unit-tests	4s
update-docs	4s
	1h 57m 53s

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