Add better support for armv7a cross compilation #2943

Job	Run time
cabal	54s
nix-build	4m 12s
runghc	9s
unit-tests	6s
build-extra-hackages	6s
docs	24s
cabal-doExactConfig	9s
hix	1h 5m 48s
hydra-ifdLevel-0-and-1	4m 2s
multi-target	2m 7s
plan-extra-hackages	7s
shellFor-hoogle	1m 22s
maintainer-scripts	7s
shellFor-multiple-package	2m 51s
shellFor-not-depends	20s
shellFor-single-package	2m 26s
tests-benchmarks	12s
check-materialization-concurrency	20s
check-path-support	9s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	52m 16s
hix-cabal	2m 21s
hydra-ifdLevel-2	16m 44s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc9101	3m 1s
hydra-without-remote-builders-ghc966	3m 0s
update-docs	5s
nix-tools	17s
	3h 13m 48s

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