[MacPorts] #14071: mono update to 1.2.6

[MacPorts]

#14071: mono update to 1.2.6
------------------------------+---------------------------------------------
 Reporter:  nox at macports.org  |       Owner:  mww at macports.org
     Type:  enhancement       |      Status:  new             
 Priority:  Normal            |   Milestone:  Port Updates    
Component:  ports             |     Version:  1.6.0           
 Keywords:                    |  
------------------------------+---------------------------------------------
 Changes:
  * Updated to 1.2.6.
  * Added X11 dependency needed by System.Windows.Form.
  * Documentation directory is now versioned for consistency with other
 ports.
  * Removed useless mandir  configure argument.
  * Fixed pthread linking.
  * Removed useless configure.env settings and bison dependency (works well
 with the one provided by Apple).

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14071>
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