Do not delete the JavaHL test dir during "make clean", so that it can be
symlinked into a RAM disk.

* Makefile.in (clean-javahl): Remove the contents of $(javahl_test_rootdir),
   but not the directory itself. Stolen from check-clean.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1539215 13f79535-47bb-0310-9956-ffa450edef68