Ren Qian code compilation error modification

Ubuntu18 In the environment
Compiled by Ren Qian lidar-location appear fatal error: lidar_localization/saveMap.h: There is no file or directory error
resolvent ：

1. stay Cmakelists.txt Lieutenant general add_dependencies(viewer_node ${catkin_EXPORTED_TARGETS} save_gencpp) It is amended as follows add_dependencies(viewer_node ${catkin_EXPORTED_TARGETS} ${PROJECT_NAME}_gencpp)
2. stay Package.xml Lieutenant general <build_export_depend>message_generation</build_export_depend> It is amended as follows
   <build_depend>message_generation</build_depend>