RFR: 8159408: remove the duplicated entry in jdk.rmic javac.properties

[Leo Jiang]

Hi all,

Please review this minor change to remove the duplicated entry in jdk.rmic javac.properties.

Bug: https://bugs.openjdk.java.net/browse/JDK-8159408
Webrev: http://cr.openjdk.java.net/~ljiang/8159408/webrev/

Thanks,
Leo