Generate dummy-ghc from raw ghc source #2115

Job	Run time
runghc	2m 32s
unit-tests	9s
cabal	1m 37s
cabal-doExactConfig	2m 30s
multi-target	2m 45s
nix-build	3m 37s
tests-benchmarks	13s
build-extra-hackages	1m 36s
maintainer-scripts	1m 8s
plan-extra-hackages	1m 36s
shellFor-hoogle	27s
shellFor-not-depends	18s
shellFor-multiple-package	18s
shellFor-single-package	22s
check-materialization-concurrency	22s
closure-size	8s
docs	1m 44s
hix	48s
hydra-ifdLevel-0-and-1	19s
hydra-ifdLevel-2	15s
hydra-ifdLevel-3-and-ghc-8-10	16s
hydra-ifdLevel-3-and-ghc-9-2	18s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	12s
update-docs	8s
check-path-support	15s
haskell-nix-roots-do-not-require-IFDs	55s
hix-cabal	35s
hydra-without-remote-builders	2m 28s
nix-tools	42s
	28m 33s

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