Add better support for armv7a cross compilation #2818

Job	Run time
nix-build	2h 9m 23s
cabal	20s
unit-tests	10s
cabal-doExactConfig	9s
multi-target	29s
maintainer-scripts	7s
runghc	19s
shellFor-hoogle	9s
shellFor-multiple-package	11s
shellFor-not-depends	12s
shellFor-single-package	18s
tests-benchmarks	10s
build-extra-hackages	13s
check-materialization-concurrency	25s
closure-size	7s
docs	19s
hydra-ifdLevel-0-and-1	7m 22s
hix	27s
hydra-ifdLevel-2	10m 21s
hydra-ifdLevel-3	3m 22s
plan-extra-hackages	11s
update-docs	8s
check-path-support	5s
haskell-nix-roots-do-not-require-IFDs	39s
hix-cabal	18s
hydra-without-remote-builders-ghc8107	7s
hydra-without-remote-builders-ghc9101	7s
nix-tools	11s
	2h 36m 19s

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