[MacPorts] #17480: fvwm2 needs to build to prefix, not x11prefix

[MacPorts]

#17480: fvwm2 needs to build to prefix, not x11prefix
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 Reporter:  jeremyhu@…             |       Owner:  pguyot@…           
     Type:  defect                 |      Status:  new                
 Priority:  Normal                 |   Milestone:  Port Bugs          
Component:  ports                  |     Version:  1.6.0              
 Keywords:                         |        Port:  fvwm2              
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 orbit fails to build for me, so I also added a without_gnome variant and
 fixed up some other issues with the Portfile that I saw.

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Ticket URL: <http://trac.macports.org/ticket/17480>
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