Add better support for armv7a cross compilation #2984

Job	Run time
nix-build	2m 17s
unit-tests	5s
runghc	22s
cabal	18s
cabal-doExactConfig	24s
multi-target	1m 39s
shellFor-multiple-package	1m 21s
tests-benchmarks	9s
maintainer-scripts	14s
plan-extra-hackages	8s
shellFor-hoogle	1m 35s
shellFor-not-depends	22s
shellFor-single-package	1m 15s
docs	2m 31s
build-extra-hackages	13s
hix	1m 46s
hydra-ifdLevel-2	12m 12s
hydra-ifdLevel-0-and-1	6m 3s
hydra-ifdLevel-3	30m 11s
check-materialization-concurrency	20s
check-path-support	11s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	1m 10s
hix-cabal	14s
hydra-without-remote-builders-ghc9101	4m 4s
hydra-without-remote-builders-ghc966	10s
nix-tools	24s
update-docs	9s
	1h 9m 50s

Provide feedback