[GHC] #13979: Don't use gtar to produce FreeBSD binary distribution

[GHC]

#13979: Don't use gtar to produce FreeBSD binary distribution
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  task              |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13974            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I think actually just passing `--format=posix` will be sufficient.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13979#comment:2>
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