cpp_test_suite/environment/CMakeLists.txt: Fix missing EOL

Author: t-b

cpp_test_suite/environment/CMakeLists.txt

@@ -20,4 +20,4 @@ add_custom_target(run-tests ${CMAKE_CURRENT_BINARY_DIR}/run.sh
 execute_process(COMMAND chmod +x ${CMAKE_CURRENT_SOURCE_DIR}/shutdown.sh)
 add_custom_target(stop-tango ${CMAKE_CURRENT_SOURCE_DIR}/shutdown.sh
         WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
-        SOURCES shutdown.sh)
+        SOURCES shutdown.sh)