fix some struct padding to match LSB/glibc ABI where it may be helpful
diff --git a/include/signal.h b/include/signal.h
index 1b58908..6625981 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -54,6 +54,7 @@
 	int sigev_notify;
 	void (*sigev_notify_function)(union sigval);
 	pthread_attr_t *sigev_notify_attributes;
+	char __pad[56-3*sizeof(long)];
 };
 
 #define SIGEV_SIGNAL 0