Generate dummy-ghc from raw ghc source #2106

Job	Run time
build-extra-hackages	8s
cabal-doExactConfig	22s
cabal	24s
check-materialization-concurrency	21s
check-path-support	7s
closure-size	4s
docs	41s
haskell-nix-roots-do-not-require-IFDs	8s
hix	3m 13s
hix-cabal	40s
hydra-ifdLevel-0-and-1	25s
hydra-ifdLevel-2	16s
hydra-ifdLevel-3-and-ghc-8-10	16s
hydra-ifdLevel-3-and-ghc-9-2	22s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	13s
hydra-without-remote-builders	2m 26s
maintainer-scripts	8s
multi-target	28s
nix-build	6m 25s
plan-extra-hackages	6s
runghc	13s
shellFor-hoogle	18s
shellFor-multiple-package	25s
shellFor-not-depends	19s
shellFor-single-package	25s
tests-benchmarks	12s
unit-tests	10s
update-docs	5s
nix-tools	36s
	19m 56s

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