Remove useless const qualifiers from returns

Remove const qualifiers applied to POD return values, as these are
meaningless and ignored by the compiler and are therefore potentially
misleading. (They also trip -Wignored-qualifiers.)

Extras/HACD/hacdVector.inl

@@ -162,7 +162,7 @@ namespace HACD
 	inline Vec3<T>::Vec3() {}
     
     template<typename T>
-    inline const bool Colinear(const Vec3<T> & a, const Vec3<T> & b, const Vec3<T> & c)
+    inline bool Colinear(const Vec3<T> & a, const Vec3<T> & b, const Vec3<T> & c)
     {
         return  ((c.Z() - a.Z()) * (b.Y() - a.Y()) - (b.Z() - a.Z()) * (c.Y() - a.Y()) == 0.0 /*EPS*/) &&
                 ((b.Z() - a.Z()) * (c.X() - a.X()) - (b.X() - a.X()) * (c.Z() - a.Z()) == 0.0 /*EPS*/) &&
@@ -175,4 +175,4 @@ namespace HACD
         return (a-d) * ((b-d) ^ (c-d));
     }
 }
-#endif //HACD_VECTOR_INL
+#endif //HACD_VECTOR_INL