Add better support for armv7a cross compilation #2920

Job	Run time
nix-build	20m 43s
cabal-doExactConfig	1m 20s
cabal	58s
tests-benchmarks	1m 3s
runghc	8s
unit-tests	6s
build-extra-hackages	50s
docs	10m 0s
hydra-ifdLevel-0-and-1	11m 56s
hix	12m 12s
maintainer-scripts	7s
multi-target	4m 31s
shellFor-hoogle	4m 3s
plan-extra-hackages	7s
shellFor-multiple-package	7m 55s
shellFor-not-depends	22s
shellFor-single-package	3m 18s
check-materialization-concurrency	20s
check-path-support	12s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	1m 22s
hix-cabal	13s
hydra-ifdLevel-2	9m 24s
hydra-ifdLevel-3	30m 17s
hydra-without-remote-builders-ghc9101	3m 22s
hydra-without-remote-builders-ghc966	3m 21s
nix-tools	13s
update-docs	4s
	2h 8m 34s

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