[MacPorts] #27919: py*-biopython: Add flex variant

[MacPorts]

#27919: py*-biopython: Add flex variant
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 Reporter:  michelle.lynn.gill@…          |       Owner:  mmoll@…                                                     
     Type:  enhancement                   |      Status:  new                                                         
 Priority:  Normal                        |   Milestone:                                                              
Component:  ports                         |     Version:  1.9.2                                                       
 Keywords:  python science                |        Port:  py-biopython, py25-biopython, py26-biopython, py27-biopython
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Comment(by michelle.lynn.gill@…):

 Replying to [comment:5 ryandesign@…]:
 > The comments in the setup file say it is a build dependency on flex, but
 you have indicated in the portfile a library dependency on flex.
 >
 > Flex is not so large a dependency. Perhaps we should just dispense with
 the variant and enable this all the time? Having fewer variants is better,
 as is providing a fully-functional port by default.

 Yes, I think this is fine too. In fact, I originally setup the Portfile
 this way. I ended up creating a variant since I'm not the maintainer and
 wasn't sure if there was a reason for not including it to begin with.

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Ticket URL: <https://trac.macports.org/ticket/27919#comment:7>
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