databases/mariadb55-server: Update to 5.5.47

[brnrd]

Summary

Proposed commit log

databases/mariadb55-server: Update to 5.5.47

 - Bug-fix release

The release notes for MariaDB 5.5.47 can be found at:

 - https://mariadb.com/kb/en/mariadb/mariadb-5547-release-notes/

Reviewed_by:	koobs (mentor), feld (mentor)
Approved by:
Differential_Revision: https://reviews.freebsd.org/D4485

Test Plan

• poudriere testport -client, -server
• portlint -AC (no change)

[koobs]

LGTM, pending maintainer approval, but I see no PR reference for this change so that the maintainer can approve

[brnrd]

Maintainer lives in Ukraine and has been unable to respond to earlier updates (@kiev.ua)

[feld]

Approved as maintainer is absent