Generate dummy-ghc from raw ghc source #2055

Job	Run time
cabal	28s
build-extra-hackages	22s
cabal-doExactConfig	27s
check-materialization-concurrency	27s
closure-size	13s
check-path-support	33s
docs	1m 18s
haskell-nix-roots-do-not-require-IFDs	15s
hix	1m 0s
hix-cabal	20s
hydra-ifdLevel-0-and-1	1m 14s
hydra-ifdLevel-3-and-ghc-8-10	25s
hydra-ifdLevel-3-and-ghc-9-2	24s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	47s
hydra-ifdLevel-2	38s
maintainer-scripts	12s
hydra-without-remote-builders	29s
multi-target	25s
nix-build	31s
plan-extra-hackages	20s
shellFor-hoogle	27s
nix-tools	30s
runghc	23s
shellFor-multiple-package	27s
shellFor-not-depends	41s
shellFor-single-package	1m 1s
tests-benchmarks	16s
unit-tests	18s
update-docs	11s
	15m 2s

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