Try fixing ghc-toolchain.nix on aarch64-darwin (#2350) #3068

Job	Run time
cabal-doExactConfig	1m 5s
cabal	1m 4s
build-extra-hackages	24s
check-materialization-concurrency	21s
check-path-support	22s
closure-size	3s
docs	8m 55s
haskell-nix-roots-do-not-require-IFDs	58s
hix	1m 38s
hix-cabal	5m 20s
hydra-ifdLevel-0-and-1	6m 23s
hydra-ifdLevel-2	9m 30s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc9101	4m 32s
hydra-without-remote-builders-ghc967	3m 25s
maintainer-scripts	8s
multi-target	38s
nix-build	2m 33s
nix-tools	38s
plan-extra-hackages	22s
shellFor-hoogle	16s
runghc	8s
shellFor-multiple-package	1m 2s
shellFor-not-depends	28s
shellFor-single-package	21s
unit-tests	5s
tests-benchmarks	7s
update-docs	4s
	1h 21m 5s

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