[MacPorts] #28716: patch to libtorrent-rasterbar for logging variant

[MacPorts]

#28716: patch to libtorrent-rasterbar for logging variant
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 Reporter:  buffyg@…        |       Owner:  macports-tickets@…                   
     Type:  update          |      Status:  new                                  
 Priority:  Normal          |   Milestone:                                       
Component:  ports           |     Version:  1.9.2                                
 Keywords:  haspatch        |        Port:  net/libtorrent-rasterbar             
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 libtorrent-rasterbar has logging features that shouldn't be available by
 default but should be available to anyone needing them. This is a variant
 to provide a minimum level of log support. This is a diff against the
 current Portfile.

 {{{
 66a67,68
 > variant error_logging { configure.args-append --enable-logging=errors }
 }}}

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Ticket URL: <https://trac.macports.org/ticket/28716>
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