[GHC] #12891: Automate symbols inclusion in RtsSymbols.c from Rts.h

[GHC]

#12891: Automate symbols inclusion in RtsSymbols.c from Rts.h
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        Reporter:  Phyx-             |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12846            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Very interesting. This looks great; thanks chris_r_timmons!

 I suppose given that the script needs to be run on a built tree it would
 be easiest to just run this at the end of `validate`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12891#comment:4>
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