[MacPorts] #51060: nghttp2 @1.9.2_0: add python35 variant

[MacPorts]

#51060: nghttp2 @1.9.2_0: add python35 variant
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  Reporter:  mschamschula@…  |      Owner:  macports-tickets@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.3.4
Resolution:                  |   Keywords:  haspatch maintainer
      Port:  nghttp2         |
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Comment (by mschamschula@…):

 Reverted to disallowing install w/o python, as nghttp2 otherwise uses the
 system's python 2.7.

 Now we throw an error if no version of python is selected.

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Ticket URL: <https://trac.macports.org/ticket/51060#comment:4>
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