Add better support for armv7a cross compilation #2969

Job	Run time
build-extra-hackages	10s
cabal-doExactConfig	16s
cabal	15s
check-materialization-concurrency	19s
check-path-support	11s
closure-size	3s
docs	1m 54s
haskell-nix-roots-do-not-require-IFDs	1m 2s
hix	58s
hix-cabal	12s
hydra-ifdLevel-0-and-1	5m 48s
hydra-ifdLevel-2	9m 51s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc9101	1m 21s
hydra-without-remote-builders-ghc966	1m 20s
maintainer-scripts	7s
multi-target	43s
nix-build	23s
nix-tools	11s
plan-extra-hackages	6s
runghc	10s
shellFor-hoogle	13s
shellFor-multiple-package	18s
shellFor-not-depends	15s
shellFor-single-package	21s
tests-benchmarks	7s
update-docs	7s
unit-tests	5s
	57m 1s

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