resolve Wunused-parameter warnings

TP2/src/rand_player.cpp

@@ -91,7 +91,7 @@ void play(char a, char b, char c, char d) {
   printf("= \n\n");
 }
 
-int main(int _ac, char **_av) {
+int main(void) {
   bool echo_on = false;
   setbuf(stdout, 0);
   setbuf(stderr, 0);