Add better support for armv7a cross compilation #2661

Job	Run time
cabal	2m 18s
build-extra-hackages	2m 12s
cabal-doExactConfig	2m 21s
check-path-support	1m 31s
closure-size	3s
check-materialization-concurrency	23s
docs	1m 46s
haskell-nix-roots-do-not-require-IFDs	1m 45s
hix	29s
hix-cabal	12s
hydra-ifdLevel-0-and-1	4m 37s
hydra-ifdLevel-2	20m 15s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc8107	7s
hydra-without-remote-builders-ghc9101	7s
maintainer-scripts	9s
multi-target	1m 18s
nix-build	23m 51s
nix-tools	6m 5s
plan-extra-hackages	19s
runghc	21s
shellFor-hoogle	2m 12s
shellFor-multiple-package	32s
shellFor-not-depends	20s
shellFor-single-package	23s
tests-benchmarks	10s
unit-tests	9s
update-docs	5s
	1h 44m 10s

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