[MacPorts] #70352: gtk3 fails to pass legacy-support include flag

[MacPorts]

#70352: gtk3 fails to pass legacy-support include flag
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  Reporter:  barracuda156          |      Owner:  mascguy
      Type:  defect                |     Status:  assigned
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.9.3
Resolution:                        |   Keywords:
      Port:  gtk3, legacy-support  |
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Comment (by fhgwright):

 I believe the `legacysupport` PortGroup sets up the proper flags for both
 the include and the library (and the dependency).  If you don't use the
 PortGroup, you'll need to do that "manually".

 This isn't an issue with `legacy-support` itself.

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Ticket URL: <https://trac.macports.org/ticket/70352#comment:1>
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