Update mysql-connector-java to 5.1.49

[php-coder]

See

• 5.1.47: https://dev.mysql.com/blog-archive/mysql-connector-j-5-1-47-ga-has-been-released/ (was broken; see 21e3a7a and 3cb0dac)
• 5.1.48: https://dev.mysql.com/blog-archive/mysql-connector-j-5-1-48/
• 5.1.49: https://dev.mysql.com/blog-archive/mysql-connector-j-5-1-49-ga-has-been-released/