Add better support for armv7a cross compilation #2617

Job	Run time
cabal-doExactConfig	9s
cabal	13s
multi-target	30s
nix-build	26s
runghc	7s
tests-benchmarks	7s
unit-tests	4s
build-extra-hackages	9s
docs	19s
hix	15s
hydra-ifdLevel-0-and-1	2m 21s
hydra-ifdLevel-2	3m 34s
maintainer-scripts	7s
plan-extra-hackages	9s
shellFor-hoogle	8s
shellFor-multiple-package	14s
shellFor-not-depends	12s
shellFor-single-package	17s
check-materialization-concurrency	22s
check-path-support	5s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	4s
hix-cabal	6s
hydra-ifdLevel-3	28m 59s
hydra-without-remote-builders-ghc8107	3s
hydra-without-remote-builders-ghc9101	2s
nix-tools	13s
update-docs	4s
	39m 23s

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