If you gotta go while on-the-go, urine in luck.  Having to pee or poop during long road trips is, now, no longer a pain in the butt as Chinese electric vehicle engineers are gearing up to roll out a fleet of cars featuring built-in toilets.  They’re putting a little restroom in your vroom-vroom.  Seres, a China-based automotive manufacturer, is rolling out plans to produce high-end cars with voice-activated toilets. BGA / Shutterstock Seres, an automotive manufacturer specializing in high-end electric vehicles (NEVs) and intelligent technology, has been granted a patent for an “in-vehicle toilet” that slides under a passenger’s seat for mid-trip…