Generate dummy-ghc from raw ghc source #2108

Job	Run time
cabal	10s
nix-build	29s
unit-tests	4s
runghc	26s
cabal-doExactConfig	8s
maintainer-scripts	5s
multi-target	10s
shellFor-hoogle	6s
shellFor-multiple-package	9s
shellFor-not-depends	9s
shellFor-single-package	16s
tests-benchmarks	13s
build-extra-hackages	5s
docs	25s
hix	2m 7s
hydra-ifdLevel-0-and-1	11s
hydra-ifdLevel-2	6s
plan-extra-hackages	6s
check-materialization-concurrency	18s
check-path-support	5s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	5s
hix-cabal	3m 1s
hydra-ifdLevel-3-and-ghc-8-10	10s
hydra-ifdLevel-3-and-ghc-9-2	7s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	6s
hydra-without-remote-builders	28s
nix-tools	24s
update-docs	4s
	10m 16s

Provide feedback