Add better support for armv7a cross compilation #2988

Job	Run time
nix-build	7m 21s
cabal-doExactConfig	32s
unit-tests	4s
cabal	31s
build-extra-hackages	32s
check-path-support	29s
closure-size	3s
docs	18m 41s
hix	2m 36s
hydra-ifdLevel-0-and-1	11m 36s
hydra-ifdLevel-2	9m 15s
hydra-ifdLevel-3	30m 10s
maintainer-scripts	7s
multi-target	2m 19s
plan-extra-hackages	8s
runghc	19s
shellFor-hoogle	5m 45s
shellFor-multiple-package	27s
shellFor-not-depends	22s
shellFor-single-package	22s
tests-benchmarks	11s
check-materialization-concurrency	22s
haskell-nix-roots-do-not-require-IFDs	13s
hix-cabal	1m 24s
hydra-without-remote-builders-ghc9101	2m 18s
hydra-without-remote-builders-ghc966	12s
nix-tools	11s
update-docs	4s
	1h 36m 34s

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