[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 jmr@…):

 There is absolutely no point adding autoconf checks for this stuff unless
 we have fallback code for when it's not available. And really, I doubt we
 care about being ''that'' portable.

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Ticket URL: <https://trac.macports.org/ticket/38582#comment:5>
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