RFR: JDK-8188050: UnsatisfiedLinkError after repo consolidation

[Tim Bell]

Erik:

> After the repo consolidation, I missed updating the
> IncludeCustomExtension calls for the JtregNative*.gmk files. This causes
> tests to fail for us since the native libraries have not been built.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8188050
>
> Webrev: http://cr.openjdk.java.net/~erikj/8188050/webrev.01/

Looks good.

/Tim