Minor javahl build breakage

There is a minor build issue with the javahl target in 1.1 RC 2.

The first time you try to make javahl the build breaks. The javac action in the
javahl target is trying to write the .class files to
subversion/bindings/java/javahl/classes. However, the classes directory does not
exist.

This is of course easy to fix. I just create the directory and rerun make javahl.

To fix this, should an empty classes directory be zipped/tarred up in the source
archive? I would guess that would be the easiest solution. But I am by no means
a gnu build guru (or even newbie. just color me confused)

Original issue reported by dkkopp