Add better support for armv7a cross compilation #2863

Job	Run time
cabal-doExactConfig	2m 2s
cabal	3m 41s
nix-build	15m 0s
runghc	2m 0s
build-extra-hackages	2m 46s
hix	9m 21s
maintainer-scripts	1m 43s
multi-target	5m 30s
plan-extra-hackages	7s
shellFor-hoogle	3m 31s
shellFor-multiple-package	3m 25s
shellFor-not-depends	58s
shellFor-single-package	2m 26s
tests-benchmarks	31s
unit-tests	6s
check-materialization-concurrency	20s
check-path-support	12s
closure-size	4s
docs	1m 16s
haskell-nix-roots-do-not-require-IFDs	1m 5s
hix-cabal	6m 5s
hydra-ifdLevel-0-and-1	6m 39s
hydra-ifdLevel-2	20m 8s
hydra-ifdLevel-3	30m 9s
hydra-without-remote-builders-ghc8107	3m 46s
hydra-without-remote-builders-ghc9101	3m 21s
nix-tools	3m 11s
update-docs	7s
	2h 9m 30s

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