[GHC] #10261: Don't build runghc if we don't have GhcWithInterpreter

[GHC]

#10261: Don't build runghc if we don't have GhcWithInterpreter
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              Reporter:  rwbarton    |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  low         |         Milestone:
             Component:  Build       |           Version:  7.10.1
  System                             |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 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).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10261>
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