Make it compile again under RHL9 (missing include of <signal.h>

event/tbgen/tevc.c

@@ -22,6 +22,7 @@
 #include <unistd.h>
 #include <time.h>
 #include <math.h>
+#include <signal.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>