Add better support for armv7a cross compilation #2752

Job	Run time
build-extra-hackages	10s
cabal	14s
cabal-doExactConfig	13s
check-materialization-concurrency	30s
check-path-support	5s
closure-size	3s
docs	27s
hix	23s
haskell-nix-roots-do-not-require-IFDs	8s
hix-cabal	6s
hydra-ifdLevel-0-and-1	3m 53s
hydra-ifdLevel-2	17m 56s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc8107	4m 5s
hydra-without-remote-builders-ghc9101	3m 1s
maintainer-scripts	7s
multi-target	31s
nix-build	30s
plan-extra-hackages	15s
runghc	6s
shellFor-hoogle	7s
shellFor-multiple-package	11s
shellFor-not-depends	12s
tests-benchmarks	9s
shellFor-single-package	15s
unit-tests	4s
update-docs	5s
nix-tools	15s
	1h 4m 16s

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