(urgent) RFR: JDK-8220529: JDK-8220383 broke test image build

[Tim Bell]

Erik:

Looks good.

Tim

> In JDK-8220529 I managed to break the test image build. This patch fixes
> that. It's still being verified as I'm sending this.
>
> In JDK-8220529 I moved some of the logic in JtregNative*.gmk into
> conditionals to avoid re-evaluating those expensive parts when building
> images. The problem with this was that some variables used in the images
> generation were defined in the now excluded parts of the makefiles. I
> changed the usage of these variables to instead find the files to copy
> using wildcard.
>
> (Just doing a build comparison was not enough in this case because the
> compare script does not verify the contents of the test image. I've
> filed a followup to fix this as well)
>
> https://bugs.openjdk.java.net/browse/JDK-8220529
>
> http://cr.openjdk.java.net/~erikj/8220529/webrev.01/
>