[MacPorts] #56373: fix lack of optimization in compiling pymol on clang compilers

[MacPorts]

#56373: fix lack of optimization in compiling pymol on clang compilers
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  Reporter:  jwhowarth  |      Owner:  (none)
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  science
      Port:  pymol      |
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Comment (by mojca):

 I see that lots of port add this flag manually. Where is this flag
 appended automatically? If there's a reasonable place where this could be
 done, maybe we should do it.

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Ticket URL: <https://trac.macports.org/ticket/56373#comment:6>
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