Switch to NetBSD's strxfrm(3).

There were two bugs in our implementation. Intel found one, but another
remainined, and tracking upstream is the way forward for functions where
we add no value.

Change-Id: Ida9bac0293fb2c4cbc942b1e0515ee0477c6538b

libc/string/strxfrm.c

@@ -1,47 +0,0 @@
-/*
- * Copyright (C) 2009 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-#include <string.h>
-
-/*
- * Transform string s2 to string s1 using the current locale so that
- * strcmp of transformed strings yields the same result as strcoll.
- * Since Bionic really does not support locales, we assume we always use
- * the C locale.
- *
- * This function is provided to make libstdc++-v3 usable.
- */
-size_t
-strxfrm(char *s1, const char *s2, size_t n)
-{
-	size_t len = strlen(s2) + 1;
-
-	if (len < n)
-		n = len;
-	memcpy(s1, s2, n);
-	return len;
-}