[MacPorts] #53009: autogen @5.18.4_1: update to 5.18.12 and update homepage

[MacPorts]

#53009: autogen @5.18.4_1: update to 5.18.12 and update homepage
--------------------+---------------------
 Reporter:  l2dy    |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.3.5
 Keywords:          |       Port:  autogen
--------------------+---------------------
 https://www.gnu.org/software/autogen/ has prettier docs and newest
 download link.

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Ticket URL: <https://trac.macports.org/ticket/53009>
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