Add better support for armv7a cross compilation #2922

Job	Run time
cabal-doExactConfig	10s
cabal	10s
nix-build	33s
runghc	8s
unit-tests	9s
build-extra-hackages	9s
docs	31s
hix	29s
hydra-ifdLevel-0-and-1	3m 33s
maintainer-scripts	10s
multi-target	30s
plan-extra-hackages	4s
shellFor-hoogle	12s
shellFor-multiple-package	12s
shellFor-not-depends	18s
shellFor-single-package	15s
tests-benchmarks	7s
check-materialization-concurrency	19s
check-path-support	13s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	12s
hix-cabal	3m 4s
hydra-ifdLevel-2	5m 52s
hydra-ifdLevel-3	30m 17s
hydra-without-remote-builders-ghc9101	35s
hydra-without-remote-builders-ghc966	2m 18s
nix-tools	13s
update-docs	4s
	50m 50s

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