[MacPorts] #68971: autoconf: update to 2.72

[MacPorts]

#68971: autoconf: update to 2.72
--------------------------------------------+----------------------
 Reporter:  aeiouaeiouaeiouaeiouaeiouaeiou  |      Owner:  (none)
     Type:  update                          |     Status:  new
 Priority:  Normal                          |  Milestone:
Component:  ports                           |    Version:
 Keywords:                                  |       Port:  autoconf
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 https://lists.gnu.org/archive/html/info-gnu/2023-12/msg00002.html

 {{{
 We are pleased to announce stable release 2.72 of GNU Autoconf.

 2.72 consists largely of bug fixes.  The most significant changes are
 support for the upcoming 2024 edition of the C standard (aka ’C23’)
 and a mechanism for enabling 64-bit time_t on 32-bit platforms
 (--enable-year2038).  See the NEWS below for a brief summary.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/68971>
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