Add better support for armv7a cross compilation #2979

Job	Run time
cabal-doExactConfig	45m 33s
nix-build	1h 49m 25s
runghc	45m 33s
cabal	1h 9m 27s
unit-tests	6s
docs	20m 39s
build-extra-hackages	1h 3m 1s
hix	1h 49m 41s
hydra-ifdLevel-0-and-1	10m 34s
hydra-ifdLevel-2	13m 51s
maintainer-scripts	9s
plan-extra-hackages	6s
multi-target	26m 54s
shellFor-hoogle	23m 1s
shellFor-multiple-package	2m 13s
shellFor-not-depends	23s
shellFor-single-package	1m 44s
tests-benchmarks	11s
check-materialization-concurrency	19s
check-path-support	10s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	16s
hix-cabal	2m 57s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc9101	44s
hydra-without-remote-builders-ghc966	7s
nix-tools	12s
update-docs	4s
	9h 37m 33s

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