Add better support for armv7a cross compilation #2633

Job	Run time
cabal	12s
cabal-doExactConfig	10s
nix-build	8s
runghc	7s
unit-tests	4s
build-extra-hackages	7s
hydra-ifdLevel-0-and-1	2m 21s
hix	15s
docs	18s
maintainer-scripts	11s
multi-target	6s
plan-extra-hackages	6s
shellFor-hoogle	11s
shellFor-multiple-package	8s
shellFor-not-depends	18s
shellFor-single-package	7s
tests-benchmarks	9s
check-materialization-concurrency	19s
check-path-support	5s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	8s
hix-cabal	6s
hydra-ifdLevel-2	2m 22s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc8107	2s
hydra-without-remote-builders-ghc9101	7s
nix-tools	10s
update-docs	4s
	38m 41s

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