message: change D_DEBUG to DNDEBUG for RelWithDebInfo
diff: @@ -34,7 +34,7 @@ IF(CMAKE_BUILD_TYPE MATCHES Debug)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -g -D_DEBUG")
  ELSEIF(CMAKE_BUILD_TYPE MATCHES RelWithDebInfo)
  message("RelWithDebInfo build")
  - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -g -D_DEBUG")
  + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -g -DNDEBUG")
  ELSE()
  message("Release build.")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -DNDEBUG")
  