Add better support for armv7a cross compilation #2986

Job	Run time
cabal	2m 21s
build-extra-hackages	15s
cabal-doExactConfig	2m 15s
docs	1m 45s
hix	1h 35m 59s
hydra-ifdLevel-0-and-1	11m 11s
hydra-ifdLevel-2	9m 25s
hydra-ifdLevel-3	30m 16s
maintainer-scripts	7s
multi-target	41s
nix-build	2m 5s
plan-extra-hackages	6s
runghc	12s
shellFor-hoogle	9m 54s
shellFor-multiple-package	9m 57s
shellFor-not-depends	19s
shellFor-single-package	22s
tests-benchmarks	12s
unit-tests	5s
check-materialization-concurrency	19s
check-path-support	8s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	13s
hix-cabal	12s
hydra-without-remote-builders-ghc966	9s
hydra-without-remote-builders-ghc9101	2m 14s
nix-tools	12s
update-docs	4s
	3h 1m 5s

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