Build nonReinstallablePkgs from pre-existing packages in plan.json #2294

Job	Run time
cabal	28s
cabal-doExactConfig	19s
nix-build	1m 31s
runghc	26s
unit-tests	8s
build-extra-hackages	9s
closure-size	9s
docs	35s
hix	46s
hydra-ifdLevel-0-and-1	27s
hydra-ifdLevel-2	56s
hydra-ifdLevel-3-and-ghc-8-10	17s
hydra-ifdLevel-3-and-ghc-9-2	41s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	12s
maintainer-scripts	23s
multi-target	16s
plan-extra-hackages	7s
shellFor-hoogle	13s
shellFor-multiple-package	28s
shellFor-not-depends	19s
tests-benchmarks	11s
shellFor-single-package	26s
update-docs	12s
check-materialization-concurrency	27s
check-path-support	8s
haskell-nix-roots-do-not-require-IFDs	6s
hix-cabal	10s
hydra-without-remote-builders	1m 49s
nix-tools	1m 13s
	13m 32s

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