[MacPorts] #28560: xmedcon: leave configure.pre_args alone

[MacPorts]

#28560: xmedcon: leave configure.pre_args alone
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 Reporter:  ryandesign@…             |       Owner:  jameskyle@…           
     Type:  enhancement              |      Status:  new                   
 Priority:  Normal                   |   Milestone:                        
Component:  ports                    |     Version:  1.9.2                 
 Keywords:                           |        Port:  xmedcon               
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 Why does the xmedcon portfile clear `configure.pre_args` (which contained
 "`--prefix=${prefix}`"), then add "`--prefix=${prefix}`" to
 `configure.args`? It seems like the attached patch would simplify things.

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Ticket URL: <https://trac.macports.org/ticket/28560>
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