msg: don't implement print_message for fmu-v2

This saves about 3.4k of flash for fmu-v2.

msg/CMakeLists.txt

@@ -177,6 +177,10 @@ foreach(msg_file ${msg_files})
 	list(APPEND uorb_sources ${msg_source_out_path}/${msg}.cpp)
 endforeach()
 
+if (px4_constrained_flash_build)
+	set(added_arguments --constrained-flash)
+endif()
+
 # Generate uORB headers
 add_custom_command(OUTPUT ${uorb_headers}
 	COMMAND ${PYTHON_EXECUTABLE} tools/px_generate_uorb_topic_files.py
@@ -187,6 +191,7 @@ add_custom_command(OUTPUT ${uorb_headers}
 		-e templates/uorb
 		-t ${CMAKE_CURRENT_BINARY_DIR}/tmp/headers
 		-q
+		${added_arguments}
 	DEPENDS
 		${msg_files}
 		templates/uorb/msg.h.em
@@ -207,6 +212,7 @@ add_custom_command(OUTPUT ${uorb_sources}
 		-e templates/uorb
 		-t ${CMAKE_CURRENT_BINARY_DIR}/tmp/sources
 		-q
+		${added_arguments}
 	DEPENDS
 		${msg_files}
 		templates/uorb/msg.cpp.em