Add better support for armv7a cross compilation #2958

Job	Run time
check-materialization-concurrency	20s
cabal	15s
cabal-doExactConfig	11s
build-extra-hackages	7s
check-path-support	6s
closure-size	3s
docs	22m 4s
haskell-nix-roots-do-not-require-IFDs	18s
hix	34s
hix-cabal	8s
hydra-ifdLevel-0-and-1	3m 33s
hydra-ifdLevel-2	3m 54s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc966	35s
hydra-without-remote-builders-ghc9101	34s
maintainer-scripts	8s
multi-target	1m 41s
nix-build	37s
nix-tools	11s
plan-extra-hackages	6s
shellFor-hoogle	10s
runghc	12s
shellFor-multiple-package	14s
shellFor-not-depends	52s
shellFor-single-package	17s
tests-benchmarks	8s
unit-tests	4s
update-docs	4s
	1h 7m 36s

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