[GHC] #9849: GHC readme.md seems out of date

[GHC]

#9849: GHC readme.md seems out of date
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       Reporter:  carter             |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 https://github.com/ghc/ghc/blob/89f5f314e32c3e80c71f4b3dcc8835ae74d7d57f/README.md
 still mentions using sync-all script, but the wiki docs say its deprecated

 https://ghc.haskell.org/trac/ghc/wiki/Building/SyncAll

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9849>
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The Glasgow Haskell Compiler