New upstream release. Addresses:

  CVE-2019-2805
  CVE-2019-2740
  CVE-2019-2739
  CVE-2019-2737
  CVE-2019-2758

Package updates:

  - includes "THIRDPARTY" in PKG_LICENSE_FILES
  - drops client_ed25519 as a dynamic plugin and install it with the lib
    as per upstream decision
  - refreshes patches

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

MariaDB is a drop-in replacement for MySQL. This commit adds a current
and stable version of MariaDB to the tree.

Quite a few ideas/patches were copied from Alpine Linux, Busybox Buildroot
and Debian.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>