[GHC] #11763: Implement `-f(no-)version-macros` flag for controlling version macro generation

[GHC]

#11763: Implement `-f(no-)version-macros` flag for controlling version macro
generation
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        Reporter:  hvr               |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10970            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 I thought this was already fixed to always generate the macros?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11763#comment:1>
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