[Pidgin] #15592: Add documentation on how to troubleshoot lack of Perl support

[Pidgin]

#15592: Add documentation on how to troubleshoot lack of Perl support
--------------------+--------------------------
 Reporter:  dandv   |      Owner:
     Type:  task    |     Status:  new
Milestone:          |  Component:  doxygen docs
  Version:  2.10.7  |   Keywords:  perl
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 https://developer.pidgin.im/wiki/Scripting%20and%20Plugins#WhydoesntmyPerlpluginshowupinthePluginsdialog
 mentions what to do if one's Perl plugin doesn't show in the list:

 {{{
 Check if your Pidgin binary includes Perl support (Help -> Build
 Information).
 }}}

 But it stops there. What are some troubleshooting steps one can follow if
 Perl support isn't enabled?

 See also ticket #14966 (which I'd like to reopen, but don't have
 privileges)

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Ticket URL: <https://developer.pidgin.im/ticket/15592>
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