RFR: JDK-8214311 dtrace gensrc has missing dependencies

[Tim Bell]

Magnus:

> Building with JOBS=1 on solaris discovered that the dtrace gensrc has
> not all dependencies properly declared. This has not been discovered
> until now, since Solaris machines is typically very parallel, and the
> needed prerequisites has just happened to have been generated before.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8214311
> WebRev:
> http://cr.openjdk.java.net/~ihse/JDK-8214311-fix-dtrace-gensrc-dependencies/webrev.01

Looks good.

Tim