[RFA/JVMTI] Update jvmti.h

[Tom Tromey]

>>>>> "Keith" == Keith Seitz <keiths@redhat.com> writes:

Keith> I would like to update our local copy of jvmti.h with the latest and
Keith> greatest that was committed to classpath. This includes adding a new
Keith> include file, jvmti_md.h (just like jni_md.h), which is empty right
Keith> now (but won't be for long).

Go for it.
This is always fine provided it doesn't break anything :-).
No reason for this kind of thing to block you ...

Tom