NetBSD implements semctl using a __semctl syscall instead of the

semsys syscall that FreeBSD kernels use. Grumble. So make the call
dependent on if __NETBSD_SYSCALLS is defined.

lib/libc/gen/semctl.c

@@ -11,5 +11,9 @@ int semctl(semid, int semnum, cmd, semun)
 	union semun semun;
 #endif
 {
+#ifdef	__NETBSD_SYSCALLS
+	return (__semctl(semid, semnum, cmd, &semun));
+#else
 	return (semsys(0, semid, semnum, cmd, &semun));
+#endif
 }