[MacPorts] #28640: port lint should warn when *-append should be used

[MacPorts]

#28640: port lint should warn when *-append should be used
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  Reporter:  l2g@…        |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  1.9.2
Resolution:               |   Keywords:
      Port:               |
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Comment (by raimue@…):

 What if a PortGroup has a `depends_lib` statement in a conditonal block?
 This regex would always match although using `depends_lib` in the Portfile
 would not be incorrect. Although it would be harmless to use depends_lib-
 append in this case.

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Ticket URL: <https://trac.macports.org/ticket/28640#comment:4>
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