In order to get rid of the MySQL C++ Connector, the sdbc driver should
be implemented using the MariaDB C connector instead. MariaDB
Connector/C is LGPL licensed, so later it can be used in the
connectivity module. This way mysqlc won't be an extension, so it could
be maintained easier.

Change-Id: I99c13ccf154b33b145d34b1e06eec85946dc82a0
Reviewed-on: https://gerrit.libreoffice.org/55960Reviewed-by: Tamás Bunth <btomi96@gmail.com>
Tested-by: Tamás Bunth <btomi96@gmail.com>