Finally applied patch to removeChildShape from btCompoundShape

http://code.google.com/p/bullet/issues/detail?id=51
Thanks to Ola Røer Thorsen for the patch!

src/LinearMath/btMatrix3x3.h

@@ -406,5 +406,11 @@ class btMatrix3x3 {
 }
 */
 
+SIMD_FORCE_INLINE bool operator==(const btMatrix3x3& m1, const btMatrix3x3& m2)
+{
+   return ( m1[0][0] == m2[0][0] && m1[1][0] == m2[1][0] && m1[2][0] == m2[2][0] &&
+            m1[0][1] == m2[0][1] && m1[1][1] == m2[1][1] && m1[2][1] == m2[2][1] &&
+            m1[0][2] == m2[0][2] && m1[1][2] == m2[1][2] && m1[2][2] == m2[2][2] );
+}
 
 #endif