Change OSRF_JAVA_DEPSDIR so building Java just works.

Change OSRF_JAVA_DEPSDIR so building Java just works.

OSRF_JAVA_DEPSDIR was being set to /opt/java by configure without any
documentation to that effect. The src/java/deps.sh downloads the deps files
to src/java/deps. This means that you cannot just build java without either
copying the jars from src/java/deps or altering src/java/Makefile.

This edit changes the AC_SUBST call to replace OSRF_JAVA_DEPSDIR with deps,
so that you can at least build java without making any changes.

Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>
Signed-off-by: Bill Erickson <berick@esilibrary.com>