[MacPorts] #18373: create variant +with_default_names

[MacPorts]

#18373: create variant +with_default_names
------------------------------+---------------------------------------------
 Reporter:  snc@…             |       Owner:  mww@…            
     Type:  enhancement       |      Status:  new              
 Priority:  Normal            |   Milestone:  Port Enhancements
Component:  ports             |     Version:  1.7.0            
 Keywords:                    |        Port:  gnutar           
------------------------------+---------------------------------------------
 It might be useful to have gnutar install without the "gnu" in front of
 the binary name.

 Coreutils has accomplished this feat:
 {{{
 variant with_default_names description {Install files without 'g' prefix}
 {
     post-destroot {
         foreach {d} {bin share/man/man1} {
             foreach {f} [glob -tails -directory ${destroot}${prefix}/${d}
 g*] {
                 ln -sf ${f} ${destroot}${prefix}/${d}/[string range ${f} 1
 end]
             }
         }
     }
 }
 }}}

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Ticket URL: <http://trac.macports.org/ticket/18373>
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