Add better support for armv7a cross compilation #2989

Job	Run time
cabal	34s
cabal-doExactConfig	7m 51s
nix-build	1h 32m 17s
runghc	31s
unit-tests	5s
build-extra-hackages	28s
hix	1h 47m 5s
maintainer-scripts	11s
multi-target	58s
plan-extra-hackages	12s
shellFor-hoogle	20m 32s
shellFor-multiple-package	17s
shellFor-not-depends	15s
shellFor-single-package	16s
tests-benchmarks	11s
check-materialization-concurrency	20s
check-path-support	5s
closure-size	3s
docs	2m 37s
haskell-nix-roots-do-not-require-IFDs	13s
hix-cabal	9s
hydra-ifdLevel-0-and-1	4m 4s
hydra-ifdLevel-2	4m 14s
hydra-ifdLevel-3	30m 14s
hydra-without-remote-builders-ghc9101	36s
hydra-without-remote-builders-ghc966	6s
update-docs	4s
nix-tools	12s
	4h 34m 40s

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