Silence warnings regarding unused function parameters

../../ntpd/ntsd.c:3:14: warning: unused parameter 'argc' [-Wunused-parameter]
int main(int argc, char *argv[])
             ^
../../ntpd/ntsd.c:3:26: warning: unused parameter 'argv' [-Wunused-parameter]
int main(int argc, char *argv[])
                         ^
2 warnings generated.