Add better support for armv7a cross compilation #2608

Job	Run time
cabal-doExactConfig	34s
cabal	32s
nix-build	15m 21s
multi-target	4m 32s
runghc	6s
tests-benchmarks	7s
unit-tests	8s
build-extra-hackages	16s
docs	23s
hix	4m 13s
hydra-ifdLevel-0-and-1	3m 6s
hydra-ifdLevel-2	11m 30s
hydra-ifdLevel-3	30m 10s
maintainer-scripts	9s
plan-extra-hackages	7s
shellFor-hoogle	10s
shellFor-multiple-package	20s
shellFor-not-depends	14s
shellFor-single-package	18s
check-materialization-concurrency	21s
check-path-support	8s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	8s
hix-cabal	13s
hydra-without-remote-builders-ghc8107	1m 24s
hydra-without-remote-builders-ghc9101	1m 10s
nix-tools	9s
update-docs	8s
	1h 16m 4s

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