Add better support for armv7a cross compilation #2957

Job	Run time
cabal	56s
build-extra-hackages	42s
cabal-doExactConfig	2m 13s
check-materialization-concurrency	20s
check-path-support	11s
closure-size	4s
docs	53s
haskell-nix-roots-do-not-require-IFDs	1h 24m 41s
hix	4m 6s
hix-cabal	1m 13s
hydra-ifdLevel-0-and-1	4m 16s
hydra-ifdLevel-2	20m 16s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9101	2m 50s
hydra-without-remote-builders-ghc966	2m 46s
maintainer-scripts	9s
multi-target	4m 8s
nix-build	14m 59s
nix-tools	1m 23s
plan-extra-hackages	29s
runghc	54s
shellFor-hoogle	31s
shellFor-multiple-package	15s
shellFor-not-depends	15s
shellFor-single-package	17s
tests-benchmarks	8s
unit-tests	6s
update-docs	7s
	2h 59m 24s

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