message: build_system: remove warning for MSVC
diff: @@ -29,6 +29,9 @@ else()
  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
  set(warnings "${warnings} -Wno-missing-braces -Wno-unused-parameter")
  endif()
  +
  + # Otherwise tinyxml2 complains.
  + set(warnings "${warnings} -Wno-old-style-cast")
  endif()
  if(APPLE)
  @@ -42,6 +45,3 @@ set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DDEBUG")
  set(CMAKE_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_COVERAGE} --coverage")
  set(CMAKE_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_COVERAGE} --coverage")
  set(CMAKE_LINKER_FLAGS_COVERAGE "${CMAKE_LINKER_FLAGS_COVERAGE} --coverage")
  -
  -# Otherwise tinyxml2 complains.
  -set(warnings "${warnings} -Wno-old-style-cast")
  