Highlights:

- Bump from 10.2.26 to 10.4.10
- auth_pam got replaced with never version, old one still available as
  auth_pam_v1
- semisync plugins were merged into the core
- Upstream now installs symlinks for binaries with mariadb prefix. To
  accommodate that this commit updates Package/mariadb/install/bin
  accordingly.
- Patches are updated with new ones from Debian and Arch (thanks!)
- libedit patch dropped because it's upstream now.

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

- added trailing '--' to logger to make it foolproof
- user is extracted from config instead of using hard-coded value
- log directory is now also extracted from config (if set)
- directory creation is now done via awk script (more robust)
- improved log messages

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

Does away with /etc/default/mysqld, introduces uci configuration
instead. The init script receives some further brushing up, like a
function (copied from Debian) to get mysqld configuration parameters
easily and quickly.

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

Also create a user "mariadb" and use it for running the server. And
add possibility to easily add command line args.

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

- create directory /etc/mysql/conf.d as without it the server refuses to
  start
- correct the path to my.cnf in the init script

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>