Add better support for armv7a cross compilation #2653

Job	Run time
cabal	1m 20s
nix-build	3m 0s
cabal-doExactConfig	1m 21s
runghc	1m 7s
unit-tests	4s
build-extra-hackages	8s
hix	33s
docs	1m 38s
hydra-ifdLevel-0-and-1	4m 57s
hydra-ifdLevel-2	14m 50s
maintainer-scripts	8s
multi-target	32s
plan-extra-hackages	10s
shellFor-multiple-package	11s
shellFor-hoogle	31s
shellFor-not-depends	14s
shellFor-single-package	19s
tests-benchmarks	7s
check-materialization-concurrency	20s
check-path-support	12s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	10s
hix-cabal	1m 23s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc8107	3s
hydra-without-remote-builders-ghc9101	7s
nix-tools	2m 5s
update-docs	4s
	1h 5m 47s

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