[MacPorts] #55484: dspam: Variants overwrite each other's dependencies

[MacPorts]

#55484: dspam: Variants overwrite each other's dependencies
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 Reporter:  ryandesign  |      Owner:  pixilla
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  dspam
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 Variants should use `depends_lib-append` not `depends_lib`

 It looks like some of the variants are also mutually exclusive, and should
 therefore be marked as conflicting with one another.

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Ticket URL: <https://trac.macports.org/ticket/55484>
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