[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 System      |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by gidyn):

 * cc: gidyn (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10261#comment:1>
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