Add better support for armv7a cross compilation #2956

Job	Run time
cabal	2m 6s
runghc	1m 38s
nix-build	15m 26s
multi-target	3m 37s
cabal-doExactConfig	1m 32s
shellFor-hoogle	2m 23s
shellFor-multiple-package	3m 8s
tests-benchmarks	16s
shellFor-single-package	2m 4s
unit-tests	5s
build-extra-hackages	9s
check-materialization-concurrency	19s
docs	10m 59s
closure-size	3s
hix	5m 4s
hydra-ifdLevel-0-and-1	5m 15s
hydra-ifdLevel-2	12m 22s
hydra-ifdLevel-3	30m 10s
maintainer-scripts	8s
plan-extra-hackages	14s
shellFor-not-depends	31s
update-docs	13s
check-path-support	21s
haskell-nix-roots-do-not-require-IFDs	18s
hix-cabal	4m 47s
hydra-without-remote-builders-ghc966	2m 45s
nix-tools	16s
hydra-without-remote-builders-ghc9101	3m 58s
	1h 50m 7s

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