Cleanup: remove redundant const qualifiers for POD types

MSVC used to warn about const mismatch for arguments passed by value.
Remove these as newer versions of MSVC no longer show this warning.

source/blender/python/mathutils/mathutils_Euler.h

@@ -37,14 +37,14 @@ typedef struct {
 
 /* prototypes */
 PyObject *Euler_CreatePyObject(const float eul[3],
-                               const short order,
+                               short order,
                                PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT;
 PyObject *Euler_CreatePyObject_wrap(float eul[3],
-                                    const short order,
+                                    short order,
                                     PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT
     ATTR_NONNULL(1);
 PyObject *Euler_CreatePyObject_cb(PyObject *cb_user,
-                                  const short order,
+                                  short order,
                                   unsigned char cb_type,
                                   unsigned char cb_subtype) ATTR_WARN_UNUSED_RESULT;