rpc_private.h: change guard

need another guard, else rpc/rpc.h might not be included

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/inet/rpc/rpc_private.h

@@ -1,4 +1,5 @@
-#ifndef _RPC_RPC_H
+#ifndef _RPC_PRIVATE_H
+#define _RPC_PRIVATE_H
 #include <rpc/rpc.h>
 
 /* Now define the internal interfaces.  */