Add signal handler for SIGTERM

As the benchmark runner doesn’t send a SIGINT but a SIGTERM, the signal
handler printing the statistics wasn’t triggered.

main.c

@@ -287,14 +287,15 @@ void printStatistics()
   printf("...\n");
 }
 
-void handleSIGINT()
+void handleSignal()
 {
   printStatistics();
   exit(0);
 }
 
 int main(int argc,char **argv) {
-  signal(SIGINT, handleSIGINT);
+  signal(SIGINT, handleSignal);
+  signal(SIGTERM, handleSignal);
 
   int i,j;