[MacPorts] #54173: xorg-libxcb: Add python36 variant

[MacPorts]

#54173: xorg-libxcb: Add python36 variant
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 Reporter:  mf2k         |      Owner:  jeremyhu
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  xorg-libxcb
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 Please add a python36 variant to xorg-libxcb

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Ticket URL: <https://trac.macports.org/ticket/54173>
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