[GHC] #15476: Add -fwarn-star-is-type to -Wcompat

[GHC]

#15476: Add -fwarn-star-is-type to -Wcompat
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           Reporter:  int-index      |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Compiler       |           Version:
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 According to the accepted proposal https://github.com/ghc-proposals/ghc-
 proposals/blob/master/proposals/0030-remove-star-kind.rst

 This change must be included in 8.8, but I think it won't do any harm to
 include it in GHC 8.6 as well.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15476>
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