message: build_system: remove unnecesary comments
diff: @@ -35,11 +35,10 @@ else()
  endif()
  if(APPLE)
  - # We need a define if on APPLE
  add_definitions("-DAPPLE")
  endif()
  -# Add DEBUG define for Debug target
  +# Add DEBUG define for Debug target because that is not done automatically.
  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DDEBUG")
  set(CMAKE_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_COVERAGE} --coverage")
  