[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:  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
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"508a3a33988d2872f580d8b727036f7f443d8b6d/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="508a3a33988d2872f580d8b727036f7f443d8b6d"
 Build system: don't build runghc if GhcWithInterpreter=NO (#10261)

 To test:
   * run `make clean` in utils/runghc
   * make sure inplace/bin doesn't contain runghc
   * set GhcWithInterpreter=NO in build.mk
   * run `make`
   * note that inplace/bin doesn't contain runghc

 It won't be installed either, nor will runhaskell.

 Differential Revision: https://phabricator.haskell.org/D920
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10261#comment:4>
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