Clean up some more compilation warnings.

Demos/BasicDemo/BasicDemo.cpp

@@ -207,7 +207,7 @@ void	BasicDemo::exitPhysics()
 	}
 
 	//delete collision shapes
-	for (unsigned int j=0;j<m_collisionShapes.size();j++)
+	for (int j=0;j<m_collisionShapes.size();j++)
 	{
 		btCollisionShape* shape = m_collisionShapes[j];
 		delete shape;

Extras/GIMPACTBullet/btGIMPACTMeshShape.cpp

@@ -299,7 +299,8 @@ void	btGIMPACTMeshShape::processAllTriangles(btTriangleCallback* callback,const
 	GDYNAMIC_ARRAY collision_result;
 
 	GIM_TRIMESH * ptrimesh;
-	int i,j;
+	int i;
+        unsigned int j;
 	vec3f trivec[3];
 	btVector3 btrivec[3];
 	GUINT * boxesresult;