code review request: 8009604, old make images failed: JarBASE64Encoder class not found

[Weijun Wang]

Please review the fix at

   http://cr.openjdk.java.net/~weijun/8009604/webrev.00/

The class was defined in jarsigner/Main.java and was removed in 
JDK-8006182, but it's still mentioned in jdk/make/common/Releases.gmk.

Noreg-build.

Thanks
Max