Add better support for armv7a cross compilation #2953

Job	Run time
cabal-doExactConfig	25s
cabal	25s
maintainer-scripts	9s
multi-target	41s
plan-extra-hackages	14s
nix-build	5m 35s
runghc	12s
shellFor-hoogle	16s
shellFor-multiple-package	24s
shellFor-not-depends	25s
shellFor-single-package	1m 18s
tests-benchmarks	9s
unit-tests	6s
build-extra-hackages	8s
closure-size	3s
docs	16m 8s
hix	1h 3m 5s
hydra-ifdLevel-0-and-1	7m 49s
hydra-ifdLevel-3	30m 15s
hydra-ifdLevel-2	20m 11s
check-materialization-concurrency	22s
check-path-support	10s
haskell-nix-roots-do-not-require-IFDs	55m 57s
hix-cabal	3m 47s
hydra-without-remote-builders-ghc9101	4m 5s
hydra-without-remote-builders-ghc966	2m 44s
nix-tools	1m 57s
update-docs	8s
	3h 37m 8s

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