Make the option structures const.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
diff --git a/extensions/libip6t_LOG.c b/extensions/libip6t_LOG.c
index 7fdbc0c..a11b8c0 100644
--- a/extensions/libip6t_LOG.c
+++ b/extensions/libip6t_LOG.c
@@ -32,7 +32,7 @@
 IPTABLES_VERSION);
 }
 
-static struct option opts[] = {
+static const struct option opts[] = {
 	{ .name = "log-level",        .has_arg = 1, .flag = 0, .val = '!' },
 	{ .name = "log-prefix",       .has_arg = 1, .flag = 0, .val = '#' },
 	{ .name = "log-tcp-sequence", .has_arg = 0, .flag = 0, .val = '1' },