OpenBSD/ports FKaG53Ymail/mu Makefile distinfo

   Update mu to 1.2.0 and add Stefan as maintainer. Diff from Stefan Hagen
   <sh+ports at codevoid dot de> with comments and ok from sthen@.
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1.18+14-9mail/mu/Makefile
1.7+2-2mail/mu/distinfo
+16-112 files

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