remove a few warnings, fix GLInstancingRenderer::drawLines

src/BulletDynamics/Featherstone/btMultiBody.cpp

@@ -819,6 +819,9 @@ void btMultiBody::stepVelocitiesMultiDof(btScalar dt,
 
 				break;
 			}
+			default:
+			{
+			}
 		}
 		
 
@@ -1329,6 +1332,10 @@ void btMultiBody::stepVelocitiesMultiDof(btScalar dt,
 
 				break;
 			}
+			default:
+			{
+			
+			}
 		}
 
 		//determine h*D^{-1}
@@ -2589,6 +2596,10 @@ void btMultiBody::stepPositionsMultiDof(btScalar dt, btScalar *pq, btScalar *pqd
 				break;
 			}
 #endif
+			default:
+			{
+			}
+
 		}
 
 		m_links[i].updateCacheMultiDof(pq);
@@ -2709,6 +2720,9 @@ void btMultiBody::filConstraintJacobianMultiDof(int link,
 					break;
 				}
 #endif
+				default:
+				{
+				}
 			}
             
         }