[MacPorts] #24579: Add SOCKS proxy support

[MacPorts]

#24579: Add SOCKS proxy support
---------------------------------+------------------------------------------
 Reporter:  raimue@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement          |      Status:  new                                  
 Priority:  Normal               |   Milestone:  MacPorts Future                      
Component:  base                 |     Version:                                       
 Keywords:  socks proxy          |        Port:                                       
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 MacPorts currently supports HTTP, HTTPS and FTP proxies from the
 environment, Mac OS X system configuration or macports.conf. But it does
 not honor any SOCKS proxy even when reading the system configuration,
 where this might be the only proxy specified.

 curl has support for SOCKS proxies but does not read them from any
 environment variable so some special handling for this proxy type would be
 necessary. More information can be found in the
 [http://curl.haxx.se/libcurl/c/libcurl-tutorial.html#Proxies libcurl
 tutorial].

 tsocks can be used to force the use of a SOCKS proxy, but it creates a
 chicken-and-egg problem for new users. SOCKS support would also allow to
 tunnel over SSH connections using the `ssh -D` option.

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Ticket URL: <http://trac.macports.org/ticket/24579>
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