topic_listener move generator to same directory

src/systemcmds/topic_listener/CMakeLists.txt

@@ -32,14 +32,12 @@
 ############################################################################
 
 add_custom_command(OUTPUT topic_listener.cpp
-                COMMAND ${PYTHON_EXECUTABLE} ${PX4_SOURCE_DIR}/Tools/generate_listener.py ${PX4_SOURCE_DIR} > topic_listener.cpp
-                DEPENDS msg_gen
+                COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/generate_listener.py ${PX4_SOURCE_DIR} > topic_listener.cpp
+                DEPENDS generate_listener.py msg_gen
                 )
 
 add_custom_target(generate_topic_listener
-	DEPENDS
-		topic_listener.cpp
-		${PX4_SOURCE_DIR}/Tools/generate_listener.py)
+	DEPENDS topic_listener.cpp generate_listener.py)
 
 px4_add_module(
 	MODULE systemcmds__topic_listener