[MacPorts] #50370: pymol: Use compilers portgroup

[MacPorts]

#50370: pymol: Use compilers portgroup
-------------------------+-----------------------------------
 Reporter:  dstrubbe@…   |      Owner:  howarth.at.macports@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.4
 Keywords:  haspatch     |       Port:  pymol
-------------------------+-----------------------------------
 Use compilers portgroup for C/C++ variants. Add openmaintainer since the
 maintainer is not a committer. Add implicit dependencies on tcl and tk.
 Patch setup script to use the right C++ compiler (the variants were being
 ignored for this).

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Ticket URL: <https://trac.macports.org/ticket/50370>
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