[ODE] minor bug

[Daniel Duhprey]

If a user geometry class is created before any call to dxGeom's constructor 
then when initColliders inside dxGeom gets called it erases over the user 
defined class.  The following patch does an initColliders before creating the 
class.  (This is with the new collision system)

--- ode/src/collision_kernel.cpp        9 Dec 2002 01:27:29 -0000       1.7
+++ ode/src/collision_kernel.cpp        18 Mar 2003 23:34:48 -0000
@@ -518,6 +518,7 @@
   }
   user_classes[num_user_classes] = *c;
   int class_number = num_user_classes + dFirstUserClass;
+  initColliders();
   setAllColliders (class_number,&dCollideUserGeomWithGeom);

   num_user_classes++;


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