Delete bundled copy of NSS and replace with README.

nss/lib/libpkix/pkix_pl_nss/pki/pkix_pl_basicconstraints.h

-/* 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/. */
-/*
- * pkix_pl_basicconstraints.h
- *
- * BasicConstraints Object Definitions
- *
- */
-
-#ifndef _PKIX_PL_BASICCONSTRAINTS_H
-#define _PKIX_PL_BASICCONSTRAINTS_H
-
-#include "pkix_pl_common.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* This structure reflects the contents of the basic constraints
- * extension as described in Section 4.2.1.10 of RFC 3280.
- * The cA flag indicates whether the public key in this certificate
- * belongs to a certification authority. The pathLen constraint
- * gives the maximum number of non-self-issued intermediate certificates
- * that may follow this certificate in a valid certification path.
- */
-struct PKIX_PL_CertBasicConstraintsStruct {
-        PKIX_Boolean isCA;
-        PKIX_Int32 pathLen;
-};
-
-PKIX_Error *
-pkix_pl_CertBasicConstraints_Create(
-        PKIX_Boolean isCA,
-        PKIX_Int32 pathLen,
-        PKIX_PL_CertBasicConstraints **object,
-        void *plContext);
-
-PKIX_Error *
-pkix_pl_CertBasicConstraints_RegisterSelf(
-        void *plContext);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _PKIX_PL_BASICCONSTRAINTS_H */