Add better support for armv7a cross compilation #2924

Job	Run time
runghc	53s
cabal	37s
unit-tests	31s
nix-build	17m 41s
cabal-doExactConfig	55s
multi-target	4m 59s
shellFor-single-package	43s
tests-benchmarks	28s
closure-size	7s
build-extra-hackages	7s
hix	42s
docs	24s
hydra-ifdLevel-0-and-1	3m 30s
hydra-ifdLevel-2	20m 17s
hydra-ifdLevel-3	30m 10s
maintainer-scripts	9s
plan-extra-hackages	10s
shellFor-hoogle	11s
shellFor-multiple-package	14s
shellFor-not-depends	15s
check-materialization-concurrency	19s
check-path-support	11s
haskell-nix-roots-do-not-require-IFDs	16s
hix-cabal	5m 13s
hydra-without-remote-builders-ghc9101	35s
hydra-without-remote-builders-ghc966	35s
nix-tools	12s
update-docs	5s
	1h 30m 29s

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