[MacPorts] #53256: py-gmpy2 @2.0.8: Add py36 subport

[MacPorts]

#53256: py-gmpy2 @2.0.8: Add py36 subport
--------------------------+---------------------------------
  Reporter:  mndavidoff   |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch maintainer
      Port:  py-gmpy2     |
--------------------------+---------------------------------
Changes (by mndavidoff):

 * Attachment "Portfile.diff" added.


--
Ticket URL: <https://trac.macports.org/ticket/53256>
MacPorts <https://www.macports.org/>
Ports system for macOS