Use a different check for duplicate vertices,

Thanks to fastflo, see http://code.google.com/p/bullet/issues/detail?id=555
and http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=7511&p=25762#p25762
Added missing Intel OpenCL build file, and fix some compile issue due to missing external

src/BulletCollision/CollisionShapes/btPolyhedralConvexShape.cpp

@@ -213,7 +213,8 @@ bool	btPolyhedralConvexShape::initializePolyhedralFeatures()
 
 					for (int i=0;i<orgpoints.size();i++)
 					{
-						if ((rotatedPt-orgpoints[i]).length2()<0.001)
+						//if ((orgpoints[i].m_orgIndex == orgIndex) || ((rotatedPt-orgpoints[i]).length2()<0.0001))
+						if (orgpoints[i].m_orgIndex == orgIndex)
 						{
 							found=true;
 							break;