Add better support for armv7a cross compilation #2854

Job	Run time
cabal	3m 22s
build-extra-hackages	7s
cabal-doExactConfig	1m 11s
check-materialization-concurrency	23s
check-path-support	3m 49s
closure-size	3s
docs	22s
haskell-nix-roots-do-not-require-IFDs	59s
hix	10m 50s
hix-cabal	59s
hydra-ifdLevel-0-and-1	9m 3s
hydra-ifdLevel-2	20m 14s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc8107	2m 13s
hydra-without-remote-builders-ghc9101	1m 55s
maintainer-scripts	8s
multi-target	10m 24s
nix-build	19m 26s
nix-tools	15s
plan-extra-hackages	13s
runghc	7m 21s
shellFor-hoogle	8m 44s
shellFor-multiple-package	29s
shellFor-not-depends	39s
shellFor-single-package	9m 49s
tests-benchmarks	12s
unit-tests	14s
update-docs	7s
	2h 23m 46s

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