Add better support for armv7a cross compilation #2817

Job	Run time
cabal	19s
cabal-doExactConfig	15s
nix-build	45s
runghc	10s
tests-benchmarks	14s
maintainer-scripts	18s
multi-target	53s
plan-extra-hackages	9s
shellFor-hoogle	18s
shellFor-multiple-package	21s
shellFor-not-depends	27s
shellFor-single-package	32s
unit-tests	7s
build-extra-hackages	9s
check-materialization-concurrency	21s
check-path-support	14s
closure-size	4s
docs	31s
haskell-nix-roots-do-not-require-IFDs	3m 41s
hix	18m 43s
hydra-ifdLevel-2	10m 23s
hydra-ifdLevel-0-and-1	20m 15s
hydra-ifdLevel-3	8m 41s
hydra-without-remote-builders-ghc9101	16s
update-docs	15s
hix-cabal	14s
hydra-without-remote-builders-ghc8107	11s
nix-tools	25s
	1h 9m 11s

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