Add better support for armv7a cross compilation #2928

Job	Run time
cabal	2m 39s
cabal-doExactConfig	1m 59s
nix-build	29m 23s
multi-target	36s
runghc	11s
tests-benchmarks	8s
unit-tests	6s
build-extra-hackages	10s
docs	51s
hix	38s
hydra-ifdLevel-0-and-1	4m 0s
hydra-ifdLevel-2	10m 0s
hydra-ifdLevel-3	30m 17s
maintainer-scripts	7s
plan-extra-hackages	6s
shellFor-multiple-package	38s
shellFor-hoogle	13s
shellFor-not-depends	17s
shellFor-single-package	22s
check-materialization-concurrency	18s
check-path-support	10s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	17s
hix-cabal	6m 3s
hydra-without-remote-builders-ghc9101	2m 27s
hydra-without-remote-builders-ghc966	2m 32s
nix-tools	3m 37s
update-docs	4s
	1h 38m 12s

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