[MacPorts] #56778: gstreamer1-gst-plugins-base upgrade fails: Variant x11 conflicts with cocoa

[MacPorts]

#56778: gstreamer1-gst-plugins-base upgrade fails: Variant x11 conflicts with cocoa
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  Reporter:  squizzgitmon                 |      Owner:  (none)
      Type:  defect                       |     Status:  new
  Priority:  Normal                       |  Milestone:
 Component:  ports                        |    Version:
Resolution:                               |   Keywords:
      Port:  gstreamer1-gst-plugins-base  |
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Comment (by Ionic):

 I've cobbled together some... very ugly mechanism (worsened by the fact
 that we have `variant_set` in base, but not `variant_unset`).

 Adding a negative variant via `default_variants` is not sufficient to
 override the already installed variants for some reason.

 Let me test it and it'll go live.

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Ticket URL: <https://trac.macports.org/ticket/56778#comment:10>
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