[MacPorts] #18382: mcabber: updated Portfile and additional patch

[MacPorts]

#18382: mcabber: updated Portfile and additional patch
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 Reporter:  simon@…              |       Owner:  macports-tickets@…                   
     Type:  enhancement          |      Status:  new                                  
 Priority:  Normal               |   Milestone:  Port Bugs                            
Component:  ports                |     Version:  1.7.0                                
 Keywords:                       |        Port:  mcabber                              
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 Hi,

 this updated Portfile and the additional patch fix two item:
 - gpgme and libgcrypt are runtime dependencies and cannot be removed after
 building
 - works around a bug in the configure script that ignore libgnutls and
 causes errors when trying to use gnutls

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Ticket URL: <http://trac.macports.org/ticket/18382>
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