Add better support for armv7a cross compilation #2980

Job	Run time
nix-build	56m 13s
runghc	28s
cabal	14s
unit-tests	5s
cabal-doExactConfig	31s
multi-target	43s
shellFor-hoogle	35s
shellFor-multiple-package	42s
shellFor-single-package	23s
tests-benchmarks	19s
docs	1m 7s
build-extra-hackages	27s
hix	1m 26s
hydra-ifdLevel-0-and-1	20m 11s
hydra-ifdLevel-2	10m 47s
maintainer-scripts	24s
plan-extra-hackages	10s
shellFor-not-depends	43s
check-materialization-concurrency	24s
check-path-support	12s
closure-size	6s
haskell-nix-roots-do-not-require-IFDs	26s
hix-cabal	16s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc9101	19m 24s
hydra-without-remote-builders-ghc966	16s
nix-tools	3m 21s
update-docs	9s
	2h 30m 17s

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