[MacPorts] #31636: devel/autogen upgrade version to 5.12, fix livecheck

[MacPorts]

#31636: devel/autogen upgrade version to 5.12, fix livecheck
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 Reporter:  rmstonecipher@…             |       Owner:  mww@…           
     Type:  defect                      |      Status:  new             
 Priority:  Normal                      |   Milestone:                  
Component:  ports                       |     Version:  2.0.3           
 Keywords:  haspatch                    |        Port:  autogen         
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 Attached are two .diffs - an update to the autogen Portfile and a revision
 to an existing patch file - which will upgrade autogen to the current
 version and fix a livecheck which was not getting to the most-current
 version.[[br]]
 No .dylib number changes occur, so this revision should not require
 revision bumps in dependents.

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Ticket URL: <https://trac.macports.org/ticket/31636>
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