Add better support for armv7a cross compilation #2959

Job	Run time
multi-target	48s
nix-build	32m 40s
cabal-doExactConfig	19s
cabal	17s
runghc	14s
shellFor-hoogle	21s
shellFor-multiple-package	22s
shellFor-not-depends	28s
shellFor-single-package	24s
unit-tests	8s
build-extra-hackages	14s
check-materialization-concurrency	21s
tests-benchmarks	11s
check-path-support	8s
closure-size	5s
haskell-nix-roots-do-not-require-IFDs	29s
docs	38s
hix	29m 46s
hydra-ifdLevel-0-and-1	5m 48s
hydra-ifdLevel-3	30m 14s
hydra-ifdLevel-2	6m 8s
maintainer-scripts	9s
plan-extra-hackages	9s
update-docs	10s
hix-cabal	15s
hydra-without-remote-builders-ghc9101	52s
hydra-without-remote-builders-ghc966	50s
nix-tools	18s
	1h 52m 46s

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