Delete bundled copy of NSS and replace with README.

nspr/pr/src/misc/prlog2.c

-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* 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 "prbit.h"
-
-/*
-** Compute the log of the least power of 2 greater than or equal to n
-*/
-PR_IMPLEMENT(PRIntn) PR_CeilingLog2(PRUint32 n)
-{
-    PRIntn log2;
-    PR_CEILING_LOG2(log2, n);
-    return log2;
-}
-
-/*
-** Compute the log of the greatest power of 2 less than or equal to n.
-** This really just finds the highest set bit in the word.
-*/
-PR_IMPLEMENT(PRIntn) PR_FloorLog2(PRUint32 n)
-{
-    PRIntn log2;
-    PR_FLOOR_LOG2(log2, n);
-    return log2;
-}