Fixed warnings when compiling for x64 on MSVC through VS 2017 v15.3.3.

code/IFCProfile.cpp

@@ -128,7 +128,7 @@ void ProcessParametrizedProfile(const IfcParameterizedProfileDef& def, TempMesh&
             meshout.verts.push_back( IfcVector3( std::cos(angle)*radius, std::sin(angle)*radius, 0.f ));
         }
 
-        meshout.vertcnt.push_back(segments);
+        meshout.vertcnt.push_back(static_cast<unsigned int>(segments));
     }
     else if( const IfcIShapeProfileDef* const ishape = def.ToPtr<IfcIShapeProfileDef>()) {
         // construct simplified IBeam shape