mariadb: update to version 10.4.7

Josef Schlehoferrequested to merge
mariadb into master
  • Refreshed patches
  • Fixes CVEs: CVE-2019-2805 CVE-2019-2740 CVE-2019-2739 CVE-2019-2737 CVE-2019-2758

Compile tested and run tested on MOX, HBS. Tests done: Installed nextcloud, add folders and files, installed new Mariadb, rebooted and it still works.

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