Generate dummy-ghc from raw ghc source #2051

Job	Run time
build-extra-hackages	10m 28s
cabal-doExactConfig	7m 22s
cabal	7m 19s
docs	13m 21s
hydra-ifdLevel-0-and-1	2m 25s
hix	13m 37s
hydra-ifdLevel-2	25s
hydra-ifdLevel-3-and-ghc-8-10	15s
maintainer-scripts	12s
multi-target	12m 42s
nix-build	1m 37s
runghc	4m 51s
plan-extra-hackages	11s
shellFor-hoogle	11m 33s
shellFor-multiple-package	6m 25s
shellFor-not-depends	41s
shellFor-single-package	5m 38s
tests-benchmarks	1m 0s
unit-tests	43s
check-materialization-concurrency	46s
check-path-support	3m 33s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	33s
hix-cabal	56m 25s
hydra-ifdLevel-3-and-ghc-9-2	1m 5s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	13s
hydra-without-remote-builders	1m 17s
nix-tools	2m 40s
update-docs	4s
	2h 47m 28s

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