Matrix.translation wrapper vector, continent accessing to matrix[3][0:3].

this is a part of patch 29534, being applied separately

from patch [#29534] Change Matrix Representation and Access in Python to Conform with Standard Notation
by Andrew Hale (trumanblending)

source/blender/python/mathutils/mathutils.c

@@ -456,6 +456,7 @@ PyMODINIT_FUNC PyInit_mathutils(void)
 	Py_INCREF(item);
 
 	mathutils_matrix_vector_cb_index= Mathutils_RegisterCallback(&mathutils_matrix_vector_cb);
+	mathutils_matrix_column_cb_index= Mathutils_RegisterCallback(&mathutils_matrix_column_cb);
 
 	return submodule;
 }