disable arning for irrXml.

contrib/irrXML/CMakeLists.txt

@@ -9,6 +9,7 @@ set( IrrXML_SRCS
 )
 
 if ( MSVC )
+  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4127")
   ADD_DEFINITIONS( -D_SCL_SECURE_NO_WARNINGS )
   ADD_DEFINITIONS( -D_CRT_SECURE_NO_WARNINGS )
 endif ( MSVC )