Tell hadrian to use hashes in unit ids #2324

Job	Run time
cabal-doExactConfig	15s
cabal	1m 3s
nix-build	33s
runghc	12s
maintainer-scripts	1m 3s
build-extra-hackages	9s
multi-target	1m 30s
shellFor-hoogle	12s
plan-extra-hackages	8s
shellFor-multiple-package	11s
shellFor-not-depends	15s
shellFor-single-package	20s
tests-benchmarks	7s
unit-tests	10s
check-materialization-concurrency	20s
check-path-support	8s
closure-size	8s
docs	42s
hix	54s
hydra-ifdLevel-0-and-1	51s
hydra-ifdLevel-2	38s
hydra-ifdLevel-3-and-ghc-8-10	34s
hydra-ifdLevel-3-and-ghc-9-2	37s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	13s
hydra-without-remote-builders	3m 19s
update-docs	9s
haskell-nix-roots-do-not-require-IFDs	23s
hix-cabal	13s
nix-tools	2m 2s
	17m 19s

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