[MacPorts] #54174: xorg-xcb-proto: Add python36 variant

[MacPorts]

#54174: xorg-xcb-proto: Add python36 variant
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  Reporter:  mf2k            |      Owner:  jeremyhu
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  xorg-xcb-proto  |
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Comment (by mf2k):

 @jeremyhu: Is it as simple as adding the python36 variant? Or is python
 3.6 not supported? I can commit the change for xorg-xcb-proto  and xorg-
 libxcb (#54173) with your approval.

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Ticket URL: <https://trac.macports.org/ticket/54174#comment:1>
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