BLI_math rename functions:

- mult_m4_m4m4 -> mul_m4_m4m4
- mult_m3_m3m4 -> mul_m3_m3m4

these temporary names were used to avoid problems when argument order was switched.

source/blender/editors/object/object_constraint.c

@@ -773,7 +773,7 @@ static void child_get_inverse_matrix(Scene *scene, Object *ob, bConstraint *con,
 			 * the effect of the constraint
 			 */
 			invert_m4_m4(imat, pchan->pose_mat);
-			mult_m4_m4m4(tmat, pmat, imat);
+			mul_m4_m4m4(tmat, pmat, imat);
 			invert_m4_m4(invmat, tmat);
 
 			/* 5. restore constraints */