[MacPorts] #57855: py27-cairo: Add ucs4 variant

[MacPorts]

#57855: py27-cairo: Add ucs4 variant
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 Reporter:  sharris40  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  py27-cairo
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 If python27 is built with +ucs4, py27-cairo must be rebuilt from source.
 To ensure we don't download the binary packages by mistake, we can add a
 ucs4 variant to py27-cairo and require it to be active if python27 has the
 ucs4 variant active.

 This issue might apply to other py27-* ports as well.

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Ticket URL: <https://trac.macports.org/ticket/57855>
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