Delete bundled copy of NSS and replace with README.

nss/lib/util/verref.h

Index: nss/lib/util/verref.h
diff --git a/nss/lib/util/verref.h b/nss/lib/util/verref.h
deleted file mode 100644
index 2d141bb5ca7cd0c0aa3b6e77f5066e3b51ca848b..0000000000000000000000000000000000000000
--- a/nss/lib/util/verref.h
+++ /dev/null
@@ -1,40 +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/. */
-
-/* This header is used inline in a function to ensure that a version string
- * symbol is linked in and not optimized out. A volatile reference is added to
- * the variable identified by NSS_VERSION_VARIABLE.
- *
- * Use this as follows:
- *
- * #define NSS_VERSION_VARIABLE __nss_ssl_version
- * #include "verref.h"
- */
-
-/* Suppress unused variable warnings. */
-#ifdef _MSC_VER
-#pragma warning(push)
-#pragma warning(disable: 4101)
-#endif
-/* This works for both gcc and clang */
-#if defined(__GNUC__) && !defined(NSS_NO_GCC48)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-variable"
-#endif
-
-#ifndef NSS_VERSION_VARIABLE
-#error NSS_VERSION_VARIABLE must be set before including "verref.h"
-#endif
-{
-    extern const char NSS_VERSION_VARIABLE[];
-    volatile const char _nss_version_c = NSS_VERSION_VARIABLE[0];
-}
-#undef NSS_VERSION_VARIABLE
-
-#ifdef _MSC_VER
-#pragma warning(pop)
-#endif
-#if defined(__GNUC__) && !defined(NSS_NO_GCC48)
-#pragma GCC diagnostic pop
-#endif