It will probably be some time before buildings are erected by robots. But a Boston startup called RCML has built a robot that’s designed to make sure that the humans who are still building them get it right. The robot is named called Oliver, a four-wheeled mobile robot prototype that uses a 3-D laser scanner to take superaccurate maps of the structure as it is going up. RCML designed Oliver in partnership with Beverly-based Windover Construction. Both companies were assisted by Autodesk, which makes 3-D design software for the construction industry and runs a technology center in the Seaport District where architects and construction companies can learn and develop new building techniques.