Add better support for armv7a cross compilation #2663

Job	Run time
cabal	2m 19s
nix-build	57m 56s
runghc	2m 21s
build-extra-hackages	2m 14s
cabal-doExactConfig	11s
maintainer-scripts	14s
multi-target	50s
shellFor-hoogle	9m 12s
shellFor-multiple-package	8m 33s
shellFor-single-package	8m 33s
tests-benchmarks	23s
unit-tests	16s
shellFor-not-depends	38s
check-materialization-concurrency	24s
closure-size	6s
docs	3m 2s
hix	13m 27s
hydra-ifdLevel-0-and-1	13m 23s
hydra-ifdLevel-2	20m 14s
hydra-ifdLevel-3	30m 10s
plan-extra-hackages	7s
update-docs	14s
check-path-support	19s
haskell-nix-roots-do-not-require-IFDs	20s
hix-cabal	7m 8s
hydra-without-remote-builders-ghc8107	8s
hydra-without-remote-builders-ghc9101	8s
nix-tools	6m 23s
	3h 9m 13s

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