[COMMITTED] Remove unused file rtld-lowlevel.h.

--- a/nptl/sysdeps/unix/sysv/linux/rtld-lowlevel.h
+++ /dev/null
@@ -1,43 +0,0 @@ 
-/* Defintions for lowlevel handling in ld.so.
-   Copyright (C) 2006-2014 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _RTLD_LOWLEVEL_H
-#define  _RTLD_LOWLEVEL_H 1
-
-#include <atomic.h>
-#include <lowlevellock.h>
-
-
-/* Function to wait for variable become zero.  Used in ld.so for
-   reference counters.  */
-#define __rtld_waitzero(word) \
-  do {									      \
-    while (1)								      \
-      {									      \
-	int val = word;							      \
-	if (val == 0)							      \
-	  break;							      \
-	lll_futex_wait (&(word), val, LLL_PRIVATE);			      \
-      }									      \
-  } while (0)
-
-
-#define __rtld_notify(word) \
-  lll_futex_wake (&(word), 1, LLL_PRIVATE)
-
-#endif