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

[GHC]

#11434: Drop bzip2 in favor of xz
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        Reporter:  bgamari           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Build System      |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"e7eec3a1c6ec46dc5b0d9d84c8a894b6f7e27f63/ghc"
 e7eec3a1/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e7eec3a1c6ec46dc5b0d9d84c8a894b6f7e27f63"
 Use XZ compression by default

 Resolves #11434.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11434#comment:1>
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