Add better support for armv7a cross compilation #2948

Job	Run time
cabal	1m 10s
nix-build	18m 49s
unit-tests	5s
build-extra-hackages	14s
cabal-doExactConfig	55s
docs	9m 14s
hix	10m 48s
hydra-ifdLevel-0-and-1	2m 45s
maintainer-scripts	7s
multi-target	2m 8s
runghc	9s
plan-extra-hackages	5s
shellFor-hoogle	3m 43s
shellFor-multiple-package	1m 16s
shellFor-not-depends	15s
shellFor-single-package	47s
tests-benchmarks	9s
check-materialization-concurrency	18s
check-path-support	10s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	57m 31s
hix-cabal	3m 47s
hydra-ifdLevel-2	11m 0s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc9101	3m 50s
hydra-without-remote-builders-ghc966	2m 47s
nix-tools	2m 18s
update-docs	6s
	2h 44m 39s

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