RFR: JDK-8034173: Move JavaApp.icns to proper place in make/data

[Tim Bell]

Erik:

> In an effort to bring some more order to the source, I have started 
> moving files that are either data input for source generation, or 
> source code for a gensrc tool, into a subdirectory of make instead of 
> src. Here is the first patch.
>
> In addition to moving JavaApp.icns to it's proper place in the source, 
> I also change the output directory of the generated header file to 
> something that more clearly indicates that it's a native header file 
> rather than a java class or resource.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8034173
> Webrev: http://cr.openjdk.java.net/~erikj/8034173/webrev.jdk.01/


Looks good to me.

Tim