Revision 456559

Update to upstream release 1.9.2

Detailed maintainer log:
- Update to mutt 1.9.2
- Bring ats date-conditional back as a local patch file
  - Due to the patch not having versioning an update can break the port
    if the hash of the file changes
- Update greeting patch to 1.9.1

PR:		224374
Submitted by:	dereks@lifeofadishwasher.com (maintainer)
Differential Revision:	https://reviews.freebsd.org/D13509