[Pidgin] #4741: Allow STUN on non-standard ports

[Pidgin]

#4741: Allow STUN on non-standard ports
-----------------------------+----------------------------------------------
Reporter:  chemistrydioxide  |       Owner:  lschiere    
    Type:  defect            |      Status:  new         
Priority:  minor             |   Component:  unclassified
 Version:  2.3.1             |    Keywords:  STUN port   
 Pending:  0                 |  
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 Usually, STUN uses port 3478, but some STUN servers run on another port
 than 3478, e.g. 10000. Using such a STUN server, e. g.
 stun.sipgate.net:10000, doesn't work because Pidgin doesn't recognize the
 port number. Instead, it considers the port number to be a part of the
 domain and sends it to the dns(!):
 {{{
 (15:00:50) dnsquery: resolving failed for stun.sipgate.net:10000:
 name or service not known
 (14:57:21) stun: got 0 SRV responses, server: stun.sipgate.net:10000,
 port: 3478
 }}}

 I'm not shure whether we need to change libpurple in order to make it
 recognize the port entered into the same input box or add an additional
 port input box to Pidgin.

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Ticket URL: <http://developer.pidgin.im/ticket/4741>
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