Add better support for armv7a cross compilation #2966

Job	Run time
build-extra-hackages	19s
check-materialization-concurrency	20s
cabal-doExactConfig	1m 49s
cabal	1m 43s
check-path-support	1m 46s
closure-size	4s
docs	21m 3s
haskell-nix-roots-do-not-require-IFDs	1h 17m 19s
hix	1h 7m 41s
hix-cabal	3m 52s
hydra-ifdLevel-0-and-1	12m 45s
hydra-ifdLevel-2	20m 16s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc9101	5m 1s
hydra-without-remote-builders-ghc966	3m 46s
maintainer-scripts	11s
multi-target	6m 2s
nix-build	29m 25s
nix-tools	2m 9s
plan-extra-hackages	18s
runghc	22s
shellFor-multiple-package	32s
shellFor-hoogle	25s
shellFor-not-depends	29s
shellFor-single-package	34s
tests-benchmarks	16s
update-docs	5s
unit-tests	10s
	4h 48m 52s

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