[CMake] set RPATH for plugins

to fix debian packages creation on ROS buildfarm:

00:12:11 dpkg-shlibdeps: error: cannot find library libtracer.so.4.3.1 needed by
debian/ros-noetic-dynamic-graph/opt/ros/noetic/lib/dynamic-graph-plugins/libtracer-real-time.so.4.3.1
(ELF format: 'elf64-x86-64' abi: '0201003e00000000'; RPATH: '')

Author: nim65s

src/CMakeLists.txt

@@ -1,3 +1,5 @@
+SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
+
 SET(plugins
   traces/tracer
   traces/tracer-real-time
@@ -12,6 +14,7 @@ FOREACH(plugin ${plugins})
   IF(SUFFIX_SO_VERSION)
     SET_TARGET_PROPERTIES(${LIBRARY_NAME} PROPERTIES SOVERSION ${PROJECT_VERSION})
   ENDIF(SUFFIX_SO_VERSION)
+  SET_TARGET_PROPERTIES(${LIBRARY_NAME} PROPERTIES INSTALL_RPATH $ORIGIN)
 
   TARGET_LINK_LIBRARIES(${LIBRARY_NAME} ${PROJECT_NAME} ${${LIBRARY_NAME}_deps})