Disable noisy MSVC warning that will never be fixed

CMakeLists.txt

@@ -33,6 +33,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -std=c++0x")
 elseif(MSVC)
   set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 endif()
 
 if(CMAKE_SIZEOF_VOID_P EQUAL 8)