[MacPorts] #40656: Use -isystem instead of -I in default configure.cppflags

[MacPorts]

#40656: Use -isystem instead of -I in default configure.cppflags
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  closed
  Priority:  Normal        |  Milestone:  MacPorts Future
 Component:  base          |    Version:  2.2.0
Resolution:  fixed         |   Keywords:  haspatch
      Port:                |
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Comment (by ryandesign@…):

 I've been using this patch since I opened this ticket 3 months ago with
 only positive results, as far as I can tell. Of course I have not tested
 all ports, and the scenario you propose is possible. However I think the
 number of issues this change will fix will far outnumber the new problems
 it creates.

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Ticket URL: <https://trac.macports.org/ticket/40656#comment:13>
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