[MacPorts] #67504: Implicit function declaration detection code doesn't work with newer clang

[MacPorts]

#67504: Implicit function declaration detection code doesn't work with newer clang
-------------------------+-----------------------------
  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:  MacPorts Future
 Component:  base        |    Version:  2.8.1
Resolution:              |   Keywords:  haspatch
      Port:              |
-------------------------+-----------------------------
Changes (by ryandesign):

 * keywords:   => haspatch
 * milestone:   => MacPorts Future


Comment:

 https://github.com/macports/macports-base/pull/291

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Ticket URL: <https://trac.macports.org/ticket/67504#comment:2>
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