Add better support for armv7a cross compilation #2821

Job	Run time
cabal	2m 38s
cabal-doExactConfig	2m 4s
nix-build	7m 53s
runghc	1m 57s
unit-tests	5s
build-extra-hackages	1m 57s
hix	6m 17s
maintainer-scripts	1m 13s
multi-target	6m 22s
plan-extra-hackages	30s
shellFor-hoogle	2m 42s
shellFor-multiple-package	2m 43s
shellFor-not-depends	19s
shellFor-single-package	2m 44s
tests-benchmarks	11s
check-materialization-concurrency	19s
check-path-support	2m 7s
closure-size	3s
docs	1m 33s
haskell-nix-roots-do-not-require-IFDs	9s
hix-cabal	1m 39s
hydra-ifdLevel-0-and-1	6m 35s
hydra-ifdLevel-2	4m 41s
hydra-ifdLevel-3	3m 28s
hydra-without-remote-builders-ghc8107	6s
hydra-without-remote-builders-ghc9101	11s
nix-tools	12s
update-docs	4s
	1h 0m 42s

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