Mute annoying C4251 MSVC warning
Mute annoying C4251 MSVC warning

OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,ruleless/CEGUI,ruleless/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI