RFR: Rmic build for java.management.api has bad incremental behavior

[Tim Bell]

Erik:

> In Rmic-java.management.api.gmk, there is a special extra rule defined
> to move the generated class and java files into different directories.
> This construct doesn't really work well in make and on incremental
> builds, one of the recipes is always executed.
>
> I'm rewriting this by implementing direct support in SetupRMICompilation
> for separate output directories. I'm also removing some dead code in
> RMICompilation.gmk.
>
> This should very slightly improve incremental build performance on Windows.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8221703
>
> Webrev: http://cr.openjdk.java.net/~erikj/8221703/webrev.01/

Looks good.

Tim