[GHC] #8824: cloning from https://github.com/ghc/ghc.git is broken

[GHC]

#8824: cloning from https://github.com/ghc/ghc.git is broken
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       Reporter:  rwbarton          |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Build System      |           Version:  7.9
       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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 Specifically the clone works, but then `./sync-all get` fails;
 {{{
 Cloning into 'libraries/Cabal'...
 fatal: repository 'https://github.com/ghc/packages/Cabal.git/' not found
 Clone of 'https://github.com/ghc/packages/Cabal.git' into submodule path
 'libraries/Cabal' failed
 }}}

 It was broken by b755c7bd6af9f2bee47427b1eaa6c29c72b2b17a which (around
 lines 587-588) assumes the protocol is `git://`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8824>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler