[MacPorts] #14121: swi-prolog and swi-prolog-lite improvements to st and mt variants

[MacPorts]

#14121: swi-prolog and swi-prolog-lite improvements to st and mt variants
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 Reporter:  ryandesign at macports.org  |       Owner:  ryandesign at macports.org
     Type:  enhancement              |      Status:  new                    
 Priority:  Normal                   |   Milestone:  Port Enhancements      
Component:  ports                    |     Version:  1.6.0                  
 Keywords:                           |  
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 May I suggest some enhancements to the st and mt variants of the swi-
 prolog and swi-prolog-lite ports? The attached patch:

  * adds descriptions for the st and mt variants
  * marks the two variants as conflicting with one another
  * selects +mt by default only if the user did not request +st
  * removes a leftover configure.arg in swi-prolog-lite

 If these changes are alright with you let me know and I can commit them.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14121>
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