[MacPorts] #19930: mpfr update to 2.4.1p5

[MacPorts]

#19930: mpfr update to 2.4.1p5
------------------------------+---------------------------------------------
 Reporter:  nox@…             |       Owner:  vinc17@…           
     Type:  update            |      Status:  new                
 Priority:  Normal            |   Milestone:                     
Component:  ports             |     Version:                     
 Keywords:                    |        Port:  mpfr               
------------------------------+---------------------------------------------
 Changes:
  * Update to 2.4.1p5
  * Compute patchfiles based on the patch level.
  * Do not depend on lzmautils, use bzip2 archive.

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Ticket URL: <http://trac.macports.org/ticket/19930>
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