[GHC] #9184: Allow the use of Python 3 when building GHC

[GHC]

#9184: Allow the use of Python 3 when building GHC
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       Reporter:  aspidites                |             Owner:
           Type:  feature request          |            Status:  new
       Priority:  normal                   |         Milestone:
      Component:  Build System             |           Version:  7.8.2
       Keywords:  python                   |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Easy (less than 1 hour)  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:                           |         Test Case:
                                           |          Blocking:
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 According to the
 [https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows wiki],
 it is preferred that a user have Python 2.7 installed before attempting to
 build GHC. As I'm on Arch Linux the default Python version is 3.4. As
 such, rather than simply changing the shebang line to explicitly ask for
 version 2, I made it so that the scripts all use syntax that works
 properly for versions 2.7 to 3.4. I don't think I've used anything that
 disallows 2.6, but don't have that version available to check against.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9184>
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