Add patch to be able to use the library either from build dir of from install...

Add patch to be able to use the library either from build dir of from install dir. Now VISP_SCENES_DIR, VISP_ROBOT_ARMS_DIR, VISP_HAVE_OGRE_PLUGINS_PATH, VISP_HAVE_OGRE_RESOURCES_PATH defined in vpConfig.h may contain multiple path locations separated with ; character. These locations are the one to found the resources in the build tree, and the one to found the resources in the install tree.