unify SS_ONSTACK/SS_DISABLE definitions

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/uapi/linux/signal.h b/include/uapi/linux/signal.h
index dff452e..e1bd50c2 100644
--- a/include/uapi/linux/signal.h
+++ b/include/uapi/linux/signal.h
@@ -4,5 +4,7 @@
 #include <asm/signal.h>
 #include <asm/siginfo.h>
 
+#define SS_ONSTACK	1
+#define SS_DISABLE	2
 
 #endif /* _UAPI_LINUX_SIGNAL_H */