Add better support for armv7a cross compilation #2987

Job	Run time
cabal	9s
nix-build	1h 16m 7s
runghc	8s
build-extra-hackages	21s
unit-tests	6s
cabal-doExactConfig	10s
docs	22s
hix	45s
maintainer-scripts	6s
multi-target	2m 4s
plan-extra-hackages	10s
shellFor-hoogle	14s
shellFor-multiple-package	13s
shellFor-not-depends	15s
shellFor-single-package	18s
tests-benchmarks	12s
check-materialization-concurrency	20s
check-path-support	6s
closure-size	2s
haskell-nix-roots-do-not-require-IFDs	1h 3m 36s
hix-cabal	6s
hydra-ifdLevel-0-and-1	3m 51s
hydra-ifdLevel-2	4m 1s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9101	9m 54s
hydra-without-remote-builders-ghc966	6s
nix-tools	14s
update-docs	5s
	3h 14m 17s

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