[MacPorts] #65721: app portgroup: callback not used, causing issues when combined with other pgs

[MacPorts]

#65721: app portgroup: callback not used, causing issues when combined with other
pgs
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 Reporter:  mascguy    |      Owner:  mascguy
     Type:  defect     |     Status:  assigned
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.7.2
 Keywords:  portgroup  |       Port:
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 In cases where other portgroups are also used - such as `python` - this
 can result in issues. For example, it's currently necessary to place the
 inclusion for this pg at the tail end of port `gramps`, otherwise `post-
 destroot` handlers are run in the wrong order.

 This is easy enough to fix. However, we need to ensure it doesn't cause
 unexpected issues in any ports. (Hopefully such cases are few and far
 between, but we should still try to identify ahead of time.)

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Ticket URL: <https://trac.macports.org/ticket/65721>
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