[GHC] #5146: Skip all tests involving GHCi if GHCi is absent

[GHC]

#5146: Skip all tests involving GHCi if GHCi is absent
---------------------------------+------------------------------------------
    Reporter:  peteg42           |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Component:  Test Suite  
     Version:  6.12.3            |    Keywords:              
    Testcase:                    |   Blockedby:              
          Os:  Unknown/Multiple  |    Blocking:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------
 Quite a few tests in the GHC testsuite fail if GHCi is not present.
 Debian's ports of GHC to e.g. ARM do not include GHCi and hence trigger
 spurious test failures.

 It would be good if all tests that depend on GHCi (including e.g. template
 Haskell) were made to depend on it being present.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5146>
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