[GHC] #11085: Relying on the existence of CallStack in 7.10 breaks bootstrappability with 7.10.1

[GHC]

#11085: Relying on the existence of CallStack in 7.10 breaks bootstrappability with
7.10.1
-------------------------------------+-------------------------------------
           Reporter:  quchen         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):  D1472          |         Wiki Page:
-------------------------------------+-------------------------------------
 7.10.2 added the CallStack mechanism, and GHC already relies on this while
 being built. Unfortunately, it is enabled with "GLASGOW_HASKELL >= 710",
 which also applies to GHC 7.10.1, which does not have CallStack, and fails
 building the stage-1 compiler because the symbol is not found.

 This patch makes the CPP directive more strict, requiring more than 7.10
 instead of at least.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11085>
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