Branch b1_6

b=16205

fix missing definition of ppos in the original patch (causes failure on SLES9).

lustre/obdclass/linux/linux-sysctl.c

@@ -102,6 +102,7 @@ int LL_PROC_PROTO(proc_set_timeout)
 int LL_PROC_PROTO(proc_max_dirty_pages_in_mb)
 {
         int rc = 0;
+        DECLARE_LL_PROC_PPOS_DECL;
 
         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
                 *lenp = 0;