Add better support for armv7a cross compilation #2960

Job	Run time
cabal-doExactConfig	17s
cabal	15s
multi-target	46s
nix-build	1m 27s
runghc	17s
shellFor-multiple-package	22s
shellFor-single-package	26s
tests-benchmarks	14s
unit-tests	6s
build-extra-hackages	10s
check-materialization-concurrency	21s
closure-size	4s
hix	26s
docs	32s
hydra-ifdLevel-0-and-1	5m 4s
hydra-ifdLevel-2	5m 31s
hydra-ifdLevel-3	30m 16s
maintainer-scripts	9s
shellFor-not-depends	24s
shellFor-hoogle	19s
update-docs	7s
check-path-support	8s
haskell-nix-roots-do-not-require-IFDs	19s
hix-cabal	9s
hydra-without-remote-builders-ghc9101	43s
hydra-without-remote-builders-ghc966	45s
nix-tools	19s
plan-extra-hackages	9s
	50m 5s

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