[MacPorts] #46807: base: allow dots (.) in variant names

[MacPorts]

#46807: base: allow dots (.) in variant names
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  Reporter:  pixilla      |      Owner:  raimue
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:  MacPorts 2.5.0
 Component:  base         |    Version:  2.3.3
Resolution:               |   Keywords:
      Port:               |
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Comment (by raimue):

 I could not come up with any reason not to allow the dot in variant names,
 so I will implement this change by adding the dot to the allowed
 characters in the regex used to validate variant names.

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Ticket URL: <https://trac.macports.org/ticket/46807#comment:3>
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