patch 9.1.1457: compile warning with tabpanelopt

Problem:  compile warning with tabpanelopt
Solution: declare arg as UNUSED (John Marriott)

closes: #17528

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index a7b31ca..a9e7385 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1457,
+/**/
     1456,
 /**/
     1455,