RFR 8067636: ant javadoc target is broken

[A. Sundararajan]

Please review http://cr.openjdk.java.net/~sundar/8067636/ for 
https://bugs.openjdk.java.net/browse/JDK-8067636

Developers: Please run "ant javadoc" whenever you touch javadoc comments 
in any source file :-)

Thanks,
-Sundar