AP_Math: fixed build of Sub with ChibiOS

libraries/AP_Math/AP_Math.cpp

@@ -33,6 +33,7 @@ is_equal(const Arithmetic1 v_1, const Arithmetic2 v_2)
 
 template bool is_equal<int>(const int v_1, const int v_2);
 template bool is_equal<short>(const short v_1, const short v_2);
+template bool is_equal<long>(const long v_1, const long v_2);
 template bool is_equal<float>(const float v_1, const float v_2);
 template bool is_equal<double>(const double v_1, const double v_2);
 

libraries/AP_Math/vector2.cpp

@@ -159,5 +159,7 @@ template bool Vector2<float>::is_nan(void) const;
 template bool Vector2<float>::is_inf(void) const;
 template float Vector2<float>::angle(const Vector2<float> &v) const;
 
+template bool Vector2<long>::operator ==(const Vector2<long> &v) const;
+
 // define for int
 template bool Vector2<int>::operator ==(const Vector2<int> &v) const;