Add warning to public headers.

(This used to be commit 7bfe359c73aac96f8e983e8d5e9621235cf79a3a)

source4/lib/util/data_blob.h

@@ -16,6 +16,10 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+/* This is a public header file that is installed as part of Samba. 
+ * If you remove any functions or change their signature, update 
+ * the so version number. */
+
 #ifndef _SAMBA_DATABLOB_H_
 #define _SAMBA_DATABLOB_H_
 

source4/librpc/ndr/libndr.h

@@ -1,6 +1,7 @@
 /* 
    Unix SMB/CIFS implementation.
    rpc interface definitions
+
    Copyright (C) Andrew Tridgell 2003
    
    This program is free software; you can redistribute it and/or modify
@@ -17,6 +18,10 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+/* This is a public header file that is installed as part of Samba. 
+ * If you remove any functions or change their signature, update 
+ * the so version number. */
+
 #ifndef __LIBNDR_H__
 #define __LIBNDR_H__
 

source4/librpc/rpc/dcerpc.h

@@ -20,6 +20,10 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+/* This is a public header file that is installed as part of Samba. 
+ * If you remove any functions or change their signature, update 
+ * the so version number. */
+
 #ifndef __DCERPC_H__
 #define __DCERPC_H__