Add better support for armv7a cross compilation #2620

Job	Run time
cabal	9s
nix-build	28s
runghc	9s
unit-tests	5s
cabal-doExactConfig	9s
build-extra-hackages	7s
docs	22s
hix	30s
hydra-ifdLevel-0-and-1	4m 17s
maintainer-scripts	11s
multi-target	32s
plan-extra-hackages	6s
shellFor-hoogle	8s
shellFor-multiple-package	15s
shellFor-not-depends	13s
shellFor-single-package	15s
tests-benchmarks	11s
check-materialization-concurrency	21s
check-path-support	5s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	4s
hix-cabal	6s
hydra-ifdLevel-2	4m 58s
hydra-ifdLevel-3	4m 53s
hydra-without-remote-builders-ghc8107	3s
hydra-without-remote-builders-ghc9101	2s
nix-tools	8s
update-docs	4s
	18m 54s

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