[GHC] #10700: include/stg/Prim.h isn't C++ compatible

[GHC]

#10700: include/stg/Prim.h isn't C++ compatible
-------------------------------------+-------------------------------------
        Reporter:  Fabian            |                   Owner:  rasen
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Compiler (FFI)    |                 Version:  7.10.1
      Resolution:                    |                Keywords:  FFI,
                                     |  newcomers
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1107
-------------------------------------+-------------------------------------
Changes (by rasen):

 * status:  new => patch
 * differential:   => Phab:D1107


Comment:

 The build fails
 (https://phabricator.haskell.org/harbormaster/build/5215/), but the
 failure isn't related to the change.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10700#comment:3>
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