[MacPorts] #29988: bzr*: add pythonXX variants

[MacPorts]

#29988: bzr*: add pythonXX variants
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 Reporter:  macsforever2000@…             |       Owner:  raimue@…                                                                                                       
     Type:  enhancement                   |      Status:  assigned                                                                                                       
 Priority:  Normal                        |   Milestone:                                                                                                                 
Component:  ports                         |     Version:                                                                                                                 
 Keywords:                                |        Port:  bzr bzr-explorer bzr-fastimport bzr-git bzr-gtk bzr-pager bzr-rebase bzr-rewrite bzr-svn bzr-xmloutput bzrtools
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Comment(by macsforever2000@…):

 No feature gain. Indeed I am trying to reduce the number of installed
 pythons to 1.

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Ticket URL: <https://trac.macports.org/ticket/29988#comment:2>
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