Update to 5.1.39

• Modernize port: use option depended make targets
• Add PORTSCOUT config
• Support OpenJDK8
• Consequently make building the javadoc API docs contingent on the version of java used: only build when java 1.6 or 1.7 is in use. javadoc in OpenJDK 1.8 is much less forgiving than in earlier versions of java, and would require substantion patching of the sources to generate javadoc successfully.
• Use COPYTREE_SHARE to install javadocs rather than rolling our own

ChangeLog: http://dev.mysql.com/doc/relnotes/connector-j/5.1/en/news-5-1-39.html