Add better support for armv7a cross compilation #2858

Job	Run time
cabal	2m 59s
cabal-doExactConfig	3m 0s
unit-tests	9s
multi-target	4m 40s
nix-build	7m 2s
runghc	2m 8s
shellFor-multiple-package	4m 12s
shellFor-single-package	4m 2s
tests-benchmarks	9s
build-extra-hackages	2m 54s
docs	1m 10s
hix	2m 45s
hydra-ifdLevel-2	11m 11s
hydra-ifdLevel-0-and-1	16m 16s
hydra-ifdLevel-3	9m 29s
maintainer-scripts	8s
plan-extra-hackages	6s
shellFor-hoogle	7s
shellFor-not-depends	12s
check-materialization-concurrency	18s
check-path-support	7s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	11s
hix-cabal	2m 51s
hydra-without-remote-builders-ghc8107	11s
hydra-without-remote-builders-ghc9101	11s
update-docs	6s
nix-tools	17s
	1h 16m 58s

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