[GHC] #14910: Bump required autoconf version

[GHC]

#14910: Bump required autoconf version
-------------------------------------+-------------------------------------
           Reporter:  Phyx-          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
           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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 Autoconf should be set to a minimum of 2.69, to avoid this bug
 https://bugs.ruby-lang.org/issues/8179

 specifically if using e.g. autoconf 2.64 things will fail with:

 {{{
 configure:1510: error: possibly undefined macro: _m4_text_wrap_word
 If this token and others are legitimate, please use m4_pattern_allow.
 See the Autoconf documentation.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14910>
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