Add better support for armv7a cross compilation #2950

Job	Run time
cabal	44s
build-extra-hackages	25s
cabal-doExactConfig	1m 32s
docs	11m 46s
hix	1m 47s
maintainer-scripts	38s
multi-target	1m 21s
nix-build	21m 45s
plan-extra-hackages	6s
runghc	48s
shellFor-hoogle	34s
shellFor-multiple-package	19s
shellFor-not-depends	21s
shellFor-single-package	22s
tests-benchmarks	13s
unit-tests	6s
check-materialization-concurrency	20s
check-path-support	8s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	1m 10s
hix-cabal	13s
hydra-ifdLevel-0-and-1	9m 31s
hydra-ifdLevel-2	14m 16s
hydra-ifdLevel-3	30m 11s
hydra-without-remote-builders-ghc9101	5m 51s
hydra-without-remote-builders-ghc966	6m 31s
nix-tools	2m 3s
update-docs	6s
	1h 53m 11s

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