fixup! hadrian: build ghc-stageN wrapper when building the stageN:exe:ghc-bin target
This is a fixup to commit c83e4d05. Running build stage3:exe:ghc-bin
results in
Error when running Shake build system:
at want, called at src/Main.hs:104:30 in main:Main
* Depends on: stage3:exe:ghc-bin
at need, called at src/Rules/SimpleTargets.hs:37:5 in main:Rules.SimpleTargets
* Depends on: _build/ghc-stage3
at error, called at src/Development/Shake/Internal/Rules/File.hs:179:58 in shake-0.19.4-06370b7e52fa6754b4dcb4a59262762fd2a12a188b5563ce14b1ca4d368a81b3:Development.Shake.Internal.Rules.File
* Raised the exception:
Error, file does not exist and no rule available:
_build/ghc-stage3
which is fixed by this MR.