Don't build runghc if we don't have GhcWithInterpreter
On configurations with GhcWithInterpreter=NO, we should not build runghc (since it will never work), and especially not install runghc/runhaskell scripts/symlinks when the system might already have another working runhaskell (e.g., Hugs).
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.10.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | low |
| Resolution | Unresolved |
| Component | Build System |
| Test case | |
| Differential revisions | |
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| CC | |
| Operating system | |
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