[MacPorts] #40733: port lint doesn't accept uppercase letters in PortGroup names

[MacPorts]

#40733: port lint doesn't accept uppercase letters in PortGroup names
---------------------+--------------------------
 Reporter:  mojca@…  |      Owner:  ryandesign@…
     Type:  defect   |     Status:  new
 Priority:  Low      |  Milestone:
Component:  base     |    Version:  2.2.0
 Keywords:           |       Port:
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 The following error occurs with `port lint`:
 {{{
 $ port lint wxWidgets-3.0
 --->  Verifying Portfile for wxWidgets-3.0
 Error: Line 7 repeats inclusion of PortGroup select
 --->  1 errors and 0 warnings found.
 ---
 }}}
 According to Ryan `port lint` didn't expect any portgroup names to contain
 uppercase letters.

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Ticket URL: <https://trac.macports.org/ticket/40733>
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