Updated the warning about old-style inner class metadata to reflect

Updated the warning about old-style inner class metadata to reflect
the current understanding of the situation.

The change affects diagnostic output but doesn't change anything about
dex file production, per se. I also added a new test each for dx and
the vm, checking that the warning gets emitted and demonstrating the
effect (respectively).

Though it's a pretty minor change, I bumped up the version number of dx.

Added bonus: Wrapped a couple of too-long lines that I happened to notice.

Bug: 2171430
Change-Id: If6afa4ba88dca9b0e6d88603e0a5fc2e36358115