[MacPorts] #38582: RFE: update the configure.ac file in base to silence some warnings produced by autoscan

[MacPorts]

#38582: RFE: update the configure.ac file in base to silence some warnings produced
by autoscan
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  Reporter:  egall@…      |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.1.3
Resolution:               |   Keywords:  haspatch
      Port:               |
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Comment (by egall@…):

 Also this depends on #38579

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Ticket URL: <https://trac.macports.org/ticket/38582#comment:3>
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