Make the option structures const.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
diff --git a/extensions/libipt_connbytes.c b/extensions/libipt_connbytes.c
index 9b40d5a..3c20baf 100644
--- a/extensions/libipt_connbytes.c
+++ b/extensions/libipt_connbytes.c
@@ -20,7 +20,7 @@
 "\n", IPTABLES_VERSION);
 }
 
-static struct option opts[] = {
+static const struct option opts[] = {
 	{ "connbytes", 1, 0, '1' },
 	{ "connbytes-dir", 1, 0, '2' },
 	{ "connbytes-mode", 1, 0, '3' },