[GHC] #15965: readv and pread support

[GHC]

#15965: readv and pread support
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.10.1
          Component:                 |           Version:  8.6.2
  libraries/base                     |
           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:
-------------------------------------+-------------------------------------
 dcoutts mentioned that `readv` and `pread` are supported by Windows and
 all modern BSDs, and even POSIX. Perhaps we should expose this in `base`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15965>
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