[CMake] package.xml installation follows INSTALL_PYTHON_INTERFACE_ONLY

CMakeLists.txt

@@ -43,7 +43,5 @@ ENDIF(BUILD_PYTHON_INTERFACE)
 IF(NOT INSTALL_PYTHON_INTERFACE_ONLY)
   ADD_SUBDIRECTORY(include/${CUSTOM_HEADER_DIR})
   INSTALL(DIRECTORY robots DESTINATION share/${PROJECT_NAME})
+  INSTALL(FILES package.xml DESTINATION share/${PROJECT_NAME})
 ENDIF(NOT INSTALL_PYTHON_INTERFACE_ONLY)
-
-# Install catkin package.xml
-INSTALL(FILES package.xml DESTINATION share/${PROJECT_NAME})