Update NSS to 3.21 RTM and NSPR to 4.11 RTM

nss/lib/util/derdec.c

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "secder.h"
 #include "secerr.h"
 
 static PRUint32
 der_indefinite_length(unsigned char *buf, unsigned char *end)
 {
@@ skipping 157 matching lines @@
             return SECFailure;
         }
     }
 
     if ((bp + contents_len) > end) {
         /* Ran past end of buffer */
         PORT_SetError(SEC_ERROR_BAD_DER);
         return SECFailure;
     }
 
-    *header_len_p = bp - buf;
+    *header_len_p = (int)(bp - buf);
     *contents_len_p = contents_len;
 
     return SECSuccess;
 }
 
 SECStatus
 DER_Lengths(SECItem *item, int *header_len_p, PRUint32 *contents_len_p)
 {
     return(der_capture(item->data, &item->data[item->len], header_len_p,
                        contents_len_p));
 }