Add better support for armv7a cross compilation #2754

Job	Run time
cabal	1m 24s
runghc	1m 21s
cabal-doExactConfig	1m 20s
nix-build	3m 27s
tests-benchmarks	7s
unit-tests	5s
build-extra-hackages	11s
check-materialization-concurrency	25s
closure-size	3s
docs	1m 36s
haskell-nix-roots-do-not-require-IFDs	1m 26s
hix	33s
hix-cabal	9s
hydra-ifdLevel-0-and-1	6m 31s
hydra-ifdLevel-2	3m 28s
hydra-ifdLevel-3	3m 35s
hydra-without-remote-builders-ghc8107	11s
hydra-without-remote-builders-ghc9101	7s
maintainer-scripts	8s
multi-target	30s
nix-tools	13s
plan-extra-hackages	7s
shellFor-hoogle	12s
shellFor-multiple-package	11s
shellFor-not-depends	13s
shellFor-single-package	15s
update-docs	5s
check-path-support	9s
	28m 2s

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