Generate dummy-ghc from raw ghc source #2033

Job	Run time
cabal	1m 1s
unit-tests	22s
nix-build	4m 41s
runghc	1m 33s
cabal-doExactConfig	1m 47s
multi-target	1m 24s
shellFor-multiple-package	1m 1s
shellFor-single-package	2m 25s
tests-benchmarks	28s
build-extra-hackages	27s
closure-size	12s
docs	3m 44s
hix	2m 4s
hydra-ifdLevel-0-and-1	1m 34s
hydra-ifdLevel-2	44s
hydra-ifdLevel-3-and-ghc-8-10	43s
hydra-ifdLevel-3-and-ghc-9-2	53s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	47s
maintainer-scripts	32s
plan-extra-hackages	35s
shellFor-hoogle	1m 13s
shellFor-not-depends	41s
check-materialization-concurrency	30s
check-path-support	50s
hix-cabal	27s
hydra-without-remote-builders	41s
haskell-nix-roots-do-not-require-IFDs	19s
nix-tools	4m 56s
update-docs	15s
	36m 49s

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