[GHC] #10036: Update Cabal before final 7.10 release

[GHC]

#10036: Update Cabal before final 7.10 release
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              Reporter:  ezyang      |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  high        |         Milestone:  7.10.1
             Component:  libraries   |           Version:  7.10.1-rc2
  (other)                            |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 It will be good to get this fix into the released version of Cabal, so
 that 7.10-built cabal installs do the right thing when operating older
 versions of GHC.

 https://github.com/haskell/cabal/pull/2391

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10036>
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