[GHC] #10377: Remove double negative of ("Unregisterised", "NO")

[GHC]

#10377: Remove double negative of  ("Unregisterised", "NO")
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        Reporter:  erikd             |                   Owner:  erikd
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by rwbarton):

 In general I don't like making changes like this because the established
 terminology is found in documentation/papers/blog posts/StackOverflow
 answers and changing the terminology effectively reduces the value of all
 those resources.

 The term "Registered" in particular is not good since it already has a
 much more common meaning in the context of software. We don't want people
 thinking they have to register their copy of GHC!

 Personally I don't find `("Unregisterised", "NO")` confusing; I'm not sure
 why, but I think it might be because registerised is the "default", so
 unregisterised sticks out as a "positive", unusual property, despite the
 etymology. Consider also that unregisterised builds are enabled by
 `--enable-unregisterised`, we don't talk about disabling registerised-
 ness.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10377#comment:2>
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