main.c: remove unused argc + argv

src/main.c

@@ -231,7 +231,7 @@ char* rcon_command_multipacket(int sockfd, const char *command) {
     return result;
 }
 
-int main(int argc, char **argv) {
+int main(void) {
     const int PORT_NUM = read_env_int("RCON_PORT_NUMBER");
     const char *password = getenv("RCON_PASSWORD");