Add better support for armv7a cross compilation #2985

Job	Run time
cabal-doExactConfig	15s
nix-build	1h 2m 23s
runghc	10s
multi-target	20m 7s
tests-benchmarks	10s
unit-tests	19s
build-extra-hackages	1m 54s
cabal	11s
docs	2m 1s
hix	45s
hydra-ifdLevel-0-and-1	3m 59s
hydra-ifdLevel-2	20m 16s
hydra-ifdLevel-3	30m 16s
maintainer-scripts	11s
plan-extra-hackages	6s
shellFor-hoogle	17s
shellFor-multiple-package	15s
shellFor-not-depends	15s
shellFor-single-package	19s
check-materialization-concurrency	26s
check-path-support	13s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	14s
hix-cabal	12s
hydra-without-remote-builders-ghc9101	9m 30s
hydra-without-remote-builders-ghc966	9s
nix-tools	11s
update-docs	4s
	2h 35m 11s

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