Resolve DLL export warnings for MSVC++ builds.
Resolve DLL export warnings for MSVC++ builds.

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