FreeBSD/ports dc35f41 (r487283). UPDATING, net-im/ejabberd distinfo Makefile

- Update to 18.12
- Add an entry to UPDATING about changes in 18.12

Changes:                https://blog.process-one.net/ejabberd-18-12/
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+25-23net-im/ejabberd/distinfo
+14-12net-im/ejabberd/Makefile
+10-5net-im/ejabberd/pkg-plist
+8-0UPDATING
+57-404 files

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