updated for version 7.3.709

Problem:    Compiler warning for unused argument.
Solution:   Add UNUSED.

src/eval.c

@@ -16664,7 +16664,7 @@ f_shellescape(argvars, rettv)
  */
     static void
 f_shiftwidth(argvars, rettv)
-    typval_T	*argvars;
+    typval_T	*argvars UNUSED;
     typval_T	*rettv;
 {
     rettv->vval.v_number = get_sw_value();

src/version.c

@@ -725,6 +725,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    709,
 /**/
     708,
 /**/