Fix premake build by adding missing "then", thanks to 'moadib'.
Fix premake build by adding missing "then", thanks to 'moadib'.

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