Add better support for armv7a cross compilation #2816

Job	Run time
cabal-doExactConfig	3m 11s
build-extra-hackages	2m 12s
cabal	1m 34s
check-materialization-concurrency	18s
check-path-support	2m 7s
docs	2m 46s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	5m 55s
hix	12m 59s
hix-cabal	6m 52s
hydra-ifdLevel-0-and-1	12m 54s
hydra-ifdLevel-2	5m 4s
hydra-without-remote-builders-ghc8107	10s
hydra-ifdLevel-3	4m 47s
hydra-without-remote-builders-ghc9101	7s
maintainer-scripts	9s
multi-target	2m 24s
nix-build	5m 20s
nix-tools	15s
plan-extra-hackages	6s
runghc	43s
shellFor-hoogle	30s
shellFor-multiple-package	26s
shellFor-not-depends	22s
tests-benchmarks	14s
shellFor-single-package	17s
unit-tests	6s
update-docs	4s
	1h 11m 56s

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