update for mariadb

mariadb update to version 5.2.12 fixes several security
issues and bugs. Please refer to the following upstream
announcements for details:

http://kb.askmonty.org/v/mariadb-5212-release-notes
http://kb.askmonty.org/v/mariadb-5211-release-notes
http://kb.askmonty.org/v/mariadb-5210-release-notes

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