Cleanup: use "num" as a suffix in: source/blender/python

See T85728

source/blender/python/mathutils/mathutils_Vector.h

@@ -14,12 +14,13 @@ extern PyTypeObject vector_Type;
 typedef struct {
   BASE_MATH_MEMBERS(vec);
 
-  int size; /* vec size 2 or more */
+  /** Number of items in this vector (2 or more). */
+  int vec_num;
 } VectorObject;
 
 /*prototypes*/
 PyObject *Vector_CreatePyObject(const float *vec,
-                                int size,
+                                int vec_num,
                                 PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT;
 /**
  * Create a vector that wraps existing memory.
@@ -27,7 +28,7 @@ PyObject *Vector_CreatePyObject(const float *vec,
  * \param vec: Use this vector in-place.
  */
 PyObject *Vector_CreatePyObject_wrap(float *vec,
-                                     int size,
+                                     int vec_num,
                                      PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT
     ATTR_NONNULL(1);
 /**
@@ -35,13 +36,13 @@ PyObject *Vector_CreatePyObject_wrap(float *vec,
  * see: #Mathutils_RegisterCallback
  */
 PyObject *Vector_CreatePyObject_cb(PyObject *user,
-                                   int size,
+                                   int vec_num,
                                    unsigned char cb_type,
                                    unsigned char subtype) ATTR_WARN_UNUSED_RESULT;
 /**
  * \param vec: Initialized vector value to use in-place, allocated with #PyMem_Malloc
  */
 PyObject *Vector_CreatePyObject_alloc(float *vec,
-                                      int size,
+                                      int vec_num,
                                       PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT
     ATTR_NONNULL(1);