[#22045] Memory leak in Mathutils.Matrix

own fault when adding mathutils callbacks, generic destructor didnt free the matrix accessor array, made the array apart of the matrix struct since its not worth malloc'ing to save at most 16bytes.

source/blender/python/generic/mathutils_vector.h

@@ -36,14 +36,8 @@
 extern PyTypeObject vector_Type;
 #define VectorObject_Check(_v) PyObject_TypeCheck((_v), &vector_Type)
 
-typedef struct { /* keep aligned with BaseMathObject in mathutils.h */
-	PyObject_VAR_HEAD 
-	float *vec;					/*1D array of data (alias), wrapped status depends on wrapped status */
-	PyObject *cb_user;					/* if this vector references another object, otherwise NULL, *Note* this owns its reference */
-	unsigned char cb_type;	/* which user funcs do we adhere to, RNA, GameObject, etc */
-	unsigned char cb_subtype;		/* subtype: location, rotation... to avoid defining many new functions for every attribute of the same type */
-	unsigned char wrapped;		/* wrapped data type? */
-	/* end BaseMathObject */
+typedef struct {
+	BASE_MATH_MEMBERS(vec);
 
 	unsigned char size;			/* vec size 2,3 or 4 */
 } VectorObject;