Version bumped to 5.5.8 by buildsystem.
MySQL: Detect and support MariaDB.

Also adjusts the supported MySQL and MariaDB versions to:

  Good: MySQL 5.5.x, MySQL 5.6.x, MariaDB 5.5.x and MariaDB 10.0.x.

  Maybe: MySQL 5.x, MySQL 6.x, MariaDB 5.x and MariaDB 10.x.
Version bumped to 5.5.9 by buildsystem.
MySQL: Support version majors and minors with multiple digits.

The string "10.0.13" isn't >= the string "5.6."...

NB: This code will fail when majors or minors reach four digits.
Version bumped to 5.5.10 by buildsystem.