Add better support for armv7a cross compilation #2946

Job	Run time
cabal	12s
multi-target	47s
cabal-doExactConfig	13s
nix-build	14m 59s
runghc	10s
shellFor-single-package	24s
tests-benchmarks	8s
unit-tests	5s
build-extra-hackages	6s
docs	46s
hix	1h 7m 18s
hydra-ifdLevel-0-and-1	3m 54s
hydra-ifdLevel-2	4m 17s
hydra-ifdLevel-3	30m 15s
maintainer-scripts	9s
plan-extra-hackages	6s
shellFor-hoogle	14s
shellFor-multiple-package	14s
shellFor-not-depends	15s
check-materialization-concurrency	23s
check-path-support	7s
closure-size	12s
haskell-nix-roots-do-not-require-IFDs	45s
hix-cabal	31s
hydra-without-remote-builders-ghc9101	2m 57s
hydra-without-remote-builders-ghc966	3m 3s
nix-tools	47s
update-docs	5s
	2h 13m 22s

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