Add better support for armv7a cross compilation #2983

Job	Run time
cabal	59s
runghc	58s
unit-tests	9s
nix-build	1m 0s
cabal-doExactConfig	39s
maintainer-scripts	22s
multi-target	1m 15s
shellFor-hoogle	24s
plan-extra-hackages	21s
shellFor-multiple-package	28s
shellFor-not-depends	40s
shellFor-single-package	16s
tests-benchmarks	9s
build-extra-hackages	10s
check-materialization-concurrency	22s
check-path-support	11s
closure-size	2s
docs	22s
haskell-nix-roots-do-not-require-IFDs	14s
hix	55s
hydra-ifdLevel-0-and-1	3m 36s
hydra-ifdLevel-2	7m 3s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc9101	35s
hydra-without-remote-builders-ghc966	7s
update-docs	4s
nix-tools	12s
hix-cabal	2m 51s
	54m 39s

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