Add better support for armv7a cross compilation #2944

Job	Run time
cabal	48s
nix-build	16m 39s
runghc	50s
unit-tests	30s
cabal-doExactConfig	58s
multi-target	1m 29s
shellFor-hoogle	53s
shellFor-multiple-package	34s
shellFor-not-depends	15s
shellFor-single-package	30s
tests-benchmarks	9s
build-extra-hackages	6s
check-materialization-concurrency	25s
docs	1m 50s
hix	1h 11m 45s
hydra-ifdLevel-0-and-1	6m 50s
hydra-ifdLevel-2	9m 1s
hydra-ifdLevel-3	30m 16s
maintainer-scripts	7s
plan-extra-hackages	8s
update-docs	7s
check-path-support	8s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	1m 27s
hix-cabal	12s
hydra-without-remote-builders-ghc9101	3m 46s
hydra-without-remote-builders-ghc966	2m 17s
nix-tools	11s
	2h 32m 18s

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