Generate dummy-ghc from raw ghc source #2107

Job	Run time
cabal-doExactConfig	2m 40s
cabal	2m 46s
build-extra-hackages	1m 4s
check-materialization-concurrency	25s
check-path-support	2m 26s
closure-size	3s
docs	1m 45s
haskell-nix-roots-do-not-require-IFDs	12s
hix	3m 20s
hydra-ifdLevel-0-and-1	1m 31s
hix-cabal	3m 43s
hydra-ifdLevel-2	41s
hydra-ifdLevel-3-and-ghc-8-10	22s
hydra-ifdLevel-3-and-ghc-9-2	13s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	7s
hydra-without-remote-builders	3m 16s
maintainer-scripts	8s
multi-target	3m 1s
nix-build	6m 42s
nix-tools	2m 16s
plan-extra-hackages	11s
runghc	13s
shellFor-hoogle	1m 30s
shellFor-multiple-package	1m 29s
shellFor-not-depends	13s
shellFor-single-package	47s
tests-benchmarks	23s
unit-tests	5s
update-docs	3s
	41m 35s

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