Unix build: add a 'make install' target for the Java bindings that install the lib-jni.so/dylib objects into the {install_prefix}/lib. The deployment of gdal.jar is not covered (patch by lassyrob, #5424)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27105 f0d54148-0727-0410-94bb-9a71ac55c965