[MacPorts] #40297: py-robotframework-ride: fix the wxWidgets variants and explicit supported_archs

[MacPorts]

#40297: py-robotframework-ride: fix the wxWidgets variants and explicit
supported_archs
-------------------------------------+-------------------
  Reporter:  mojca@…                 |      Owner:  jwa@…
      Type:  defect                  |     Status:  new
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:                          |   Keywords:
      Port:  py-robotframework-ride  |
-------------------------------------+-------------------

Comment (by mojca@…):

 To Ryan for the comment in #40310: I would say "I told you so", but I
 didn't. See https://build.macports.org/builders/buildports-snowleopard-
 x86_64/builds/20177:
 {{{
 Error: Cannot install py27-robotframework-ride for the arch(s) 'x86_64'
 because
 Error: its dependency py27-wxpython-2.8 only supports the arch(s) 'i386
 ppc'.
 }}}
 Can you please help me fix the port? I'm 99% sure that this is also a
 problem with '''all''' ports that depend on {{{py-wxpython-2.8}}}.

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Ticket URL: <https://trac.macports.org/ticket/40297#comment:2>
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