Add better support for armv7a cross compilation #2971

Job	Run time
cabal	9s
cabal-doExactConfig	8s
multi-target	33s
nix-build	18m 34s
runghc	11s
tests-benchmarks	31s
unit-tests	4s
build-extra-hackages	6s
docs	24s
maintainer-scripts	7s
hix	12m 31s
plan-extra-hackages	5s
shellFor-hoogle	11s
shellFor-multiple-package	14s
shellFor-not-depends	18s
shellFor-single-package	18s
check-materialization-concurrency	24s
check-path-support	6s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	11s
hix-cabal	11s
hydra-ifdLevel-2	7m 48s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9101	43s
hydra-ifdLevel-0-and-1	10m 31s
hydra-without-remote-builders-ghc966	37s
update-docs	5s
nix-tools	12s
	1h 25m 31s

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