Make command line option lists const

sway/main.c

@@ -245,7 +245,7 @@ static void handle_wlr_log(enum wlr_log_importance importance,
 int main(int argc, char **argv) {
 	static int verbose = 0, debug = 0, validate = 0, allow_unsupported_gpu = 0;
 
-	static struct option long_options[] = {
+	static const struct option long_options[] = {
 		{"help", no_argument, NULL, 'h'},
 		{"config", required_argument, NULL, 'c'},
 		{"validate", no_argument, NULL, 'C'},

swaybar/main.c

@@ -18,7 +18,7 @@ int main(int argc, char **argv) {
 	char *socket_path = NULL;
 	bool debug = false;
 
-	static struct option long_options[] = {
+	static const struct option long_options[] = {
 		{"help", no_argument, NULL, 'h'},
 		{"version", no_argument, NULL, 'v'},
 		{"socket", required_argument, NULL, 's'},

swaymsg/main.c

@@ -343,7 +343,7 @@ int main(int argc, char **argv) {
 
 	sway_log_init(SWAY_INFO, NULL);
 
-	static struct option long_options[] = {
+	static const struct option long_options[] = {
 		{"help", no_argument, NULL, 'h'},
 		{"monitor", no_argument, NULL, 'm'},
 		{"pretty", no_argument, NULL, 'p'},

swaynag/config.c

@@ -51,7 +51,7 @@ int swaynag_parse_options(int argc, char **argv, struct swaynag *swaynag,
 		TO_PADDING_BTN,
 	};
 
-	static struct option opts[] = {
+	static const struct option opts[] = {
 		{"button", required_argument, NULL, 'b'},
 		{"button-no-terminal", required_argument, NULL, 'B'},
 		{"button-dismiss", required_argument, NULL, 'z'},