[GHC] #8369: Small improvements to ./sync-all

[GHC]

#8369: Small improvements to ./sync-all
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        Reporter:  nwf               |            Owner:
            Type:  bug               |           Status:  new
        Priority:  lowest            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:0481e076f3cb4010894324cac71e947c6637805a/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="0481e076f3cb4010894324cac71e947c6637805a"
 Teach sync-all how to rewrite submodule repo urls

 This applies attachment:sync-all-submodules-locally.diff from #8369

 Authored-by: Nathaniel Filardo
 Signed-off-by: Herbert Valerio Riedel <hvr at gnu.org>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8369#comment:3>
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