[GHC] #13120: Can't compile HEAD with ghc-7.10.1

[GHC]

#13120: Can't compile HEAD with ghc-7.10.1
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           Reporter:  Yuras          |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 (Yes, I'm still using `ghc-7.10.1` :) )

 `compiler/util/Util.hs` exports `GHC.Stack.CallStack`, which is available
 since `7.10.2`. We can 1) drop older versions; 2) protect the export using
 `CPP`; 3) remove the export completely because it doesn't seem to be used
 anywhere.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13120>
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