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

[GHC]

#10261: Don't build runghc if we don't have GhcWithInterpreter
-------------------------------------+-------------------------------------
        Reporter:  rwbarton          |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  low               |               Milestone:  7.12.1
       Component:  Build System      |                 Version:  7.10.1
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D920
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => patch
 * differential:   => Phab:D920
 * milestone:   => 7.12.1


Comment:

 Easy indeed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10261#comment:3>
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