Update NSPR to 4.12 and NSS to 3.23 on iOS

nss/lib/pk11wrap/pk11akey.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/. */
 /*
  * This file contains functions to manage asymetric keys, (public and
  * private keys).
  */
 #include "seccomon.h"
 #include "secmod.h"
 #include "secmodi.h"
@@ skipping 136 matching lines @@
                                         pubKey->u.dh.publicValue.len); attrs++;
             break;
         case ecKey:
             keyType = CKK_EC;
             PK11_SETATTRS(attrs, CKA_VERIFY, &cktrue, sizeof(CK_BBOOL));attrs++;
             PK11_SETATTRS(attrs, CKA_DERIVE, &cktrue, sizeof(CK_BBOOL));attrs++;
             signedattr = attrs;
             PK11_SETATTRS(attrs, CKA_EC_PARAMS, 
                           pubKey->u.ec.DEREncodedParams.data,
                           pubKey->u.ec.DEREncodedParams.len); attrs++;
-            if (PR_GetEnv("NSS_USE_DECODED_CKA_EC_POINT")) {
+            if (PR_GetEnvSecure("NSS_USE_DECODED_CKA_EC_POINT")) {
                 PK11_SETATTRS(attrs, CKA_EC_POINT, 
                           pubKey->u.ec.publicValue.data,
                           pubKey->u.ec.publicValue.len); attrs++;
             } else {
                 pubValue = SEC_ASN1EncodeItem(NULL, NULL,
                         &pubKey->u.ec.publicValue,
                         SEC_ASN1_GET(SEC_OctetStringTemplate));
                 if (pubValue == NULL) {
                     if (ckaId) {
                         SECITEM_FreeItem(ckaId,PR_TRUE);
@@ skipping 2206 matching lines @@
     for (i=0; i < objCount ; i++) {
         SECKEYPrivateKey *privKey = 
                 PK11_MakePrivKey(slot,nullKey,PR_TRUE,key_ids[i],wincx);
         SECKEY_AddPrivateKeyToListTail(keys, privKey);
    }
 
    PORT_Free(key_ids);
    return keys;
 }