RFR 8068650: https://bugs.openjdk.java.net/browse/JDK-8068650

[A. Sundararajan]

Hi,

Please review http://cr.openjdk.java.net/~sundar/8068650/ for 
https://bugs.openjdk.java.net/browse/JDK-8068650

This issue was caused by another makefile fix to generate docs for 
nashorn. I'm cc'ing nashorn-dev and jdk8u-dev as the fix has to be in 
jdk8u release(s). jdk9 has proper makefile changes (jdk8u only issue).

Thanks,
-Sundar