RFR: JDK-8176469: Warnings from the build: Unknown module: jdk.rmic specified in --patch-module

[Erik Joelsson]

Hello,

This patch removes this warning which appears repeatedly in the build 
log when using a JDK 9 boot jdk.

Bug: https://bugs.openjdk.java.net/browse/JDK-8176469

Webrev: http://cr.openjdk.java.net/~erikj/8176469/webrev.01/

/Erik