Review Request: 8005694: build-infra: Cleanup of misc changes in build-infra

[Tim Bell]

Erik:

> There are a couple of minor changes in build-infra that haven't been 
> merged to jdk8/build yet. All are small and insignificant on their own.
>
> * Removal of redundant package entries in jar exclude lists. Also 
> sorting the lists to make it easier to spot redundant packages in the 
> future.
> * Removal of unnecessary source file in native compilation
> * Cleaned up comment about code exclusion in CompileJavaClasses.gmk
>
> Not urgent but would be convenient to get in to reduce diff between 
> jdk8/build and build-infra/jdk8.
>
> http://cr.openjdk.java.net/~erikj/8005694/webrev.jdk.01/

Looks good.  Might as well tie up loose ends like this.

Tim