Follow up to r1519803 to fix a potential compilation error.

* subversion/bindings/javahl/native/JNIUtil.cpp:
   Include apr_time.h for apr_sleep and related time constants.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1519906 13f79535-47bb-0310-9956-ffa450edef68