[GHC] #11434: Drop bzip2 in favor of xz

[GHC]

#11434: Drop bzip2 in favor of xz
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Build System   |           Version:  8.0.1-rc1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In January 2016 it was proposed that we stop providing bzip2 tarballs,
 instead only offering xz-compressed tarballs. This ticket is to track this
 process.

 Ben Gamari brought this proposal to the
 [https://mail.haskell.org/pipermail/glasgow-haskell-
 users/2016-January/026123.html|mailing lists] where there was no
 objection.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11434>
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