Delete bundled copy of NSS and replace with README.

nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_string.h

Index: nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_string.h
diff --git a/nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_string.h b/nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_string.h
deleted file mode 100755
index 9270e4c5676da4568b350216c37df3545b18f28f..0000000000000000000000000000000000000000
--- a/nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_string.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* 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_string.h
- *
- * String Object Definitions
- *
- */
-
-#ifndef _PKIX_PL_STRING_H
-#define _PKIX_PL_STRING_H
-
-#include "pkix_pl_common.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct PKIX_PL_StringStruct {
-        void* utf16String;
-        PKIX_UInt32 utf16Length;
-        /* XXX For Debugging  */
-        char* escAsciiString;
-        PKIX_UInt32 escAsciiLength;
-};
-
-/* see source file for function documentation */
-
-PKIX_Error *
-pkix_pl_String_RegisterSelf(void *plContext);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _PKIX_PL_STRING_H */