Relocate alpha from ports to libc

Also fixed the following whitespace nits to satisfy the push:

sysdeps/alpha/alphaev6/memset.S:142: space before tab in indent.
sysdeps/alpha/configure:1: new blank line at EOF.
sysdeps/alpha/fpu/e_sqrt.c:126: space before tab in indent.
sysdeps/alpha/preconfigure:1: new blank line at EOF.
sysdeps/unix/sysv/linux/alpha/syscalls.list:1: new blank line at EOF.

sysdeps/unix/sysv/linux/alpha/fxstatat.c

@@ -0,0 +1,113 @@
+/* Copyright (C) 2005-2014 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/>.  */
+
+#define __fxstatat64 __fxstatat64_disable
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <kernel_stat.h>
+#include <sysdep.h>
+#include <sys/syscall.h>
+#include <xstatconv.h>
+
+#undef __fxstatat64
+
+#ifdef __ASSUME_ATFCTS
+# define __have_atfcts 1
+#endif
+
+/* Get information about the file NAME in BUF.  */
+int
+__fxstatat (int vers, int fd, const char *file, struct stat *st, int flag)
+{
+  INTERNAL_SYSCALL_DECL (err);
+  int result, errno_out;
+
+  /* ??? The __fxstatat entry point is new enough that it must be using
+     vers == _STAT_VER_KERNEL64.  For the benefit of dl-fxstatat64.c, we
+     cannot actually check this, lest the compiler not optimize the rest
+     of the function away.  */
+
+#ifdef __NR_fstatat64
+  if (__have_atfcts >= 0)
+    {
+      result = INTERNAL_SYSCALL (fstatat64, err, 4, fd, file, st, flag);
+      if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
+	return result;
+      errno_out = INTERNAL_SYSCALL_ERRNO (result, err);
+#ifndef __ASSUME_ATFCTS
+      if (errno_out == ENOSYS)
+	__have_atfcts = -1;
+      else
+#endif
+	{
+	  __set_errno (errno_out);
+	  return -1;
+	}
+    }
+#endif /* __NR_fstatat64 */
+
+  if (flag & ~AT_SYMLINK_NOFOLLOW)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  char *buf = NULL;
+
+  if (fd != AT_FDCWD && file[0] != '/')
+    {
+      size_t filelen = strlen (file);
+      if (__builtin_expect (filelen == 0, 0))
+        {
+          __set_errno (ENOENT);
+          return -1;
+        }
+
+      static const char procfd[] = "/proc/self/fd/%d/%s";
+      /* Buffer for the path name we are going to use.  It consists of
+	 - the string /proc/self/fd/
+	 - the file descriptor number
+	 - the file name provided.
+	 The final NUL is included in the sizeof.   A bit of overhead
+	 due to the format elements compensates for possible negative
+	 numbers.  */
+      size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
+      buf = alloca (buflen);
+
+      __snprintf (buf, buflen, procfd, fd, file);
+      file = buf;
+    }
+
+  if (flag & AT_SYMLINK_NOFOLLOW)
+    result = INTERNAL_SYSCALL (lstat64, err, 2, file, st);
+  else
+    result = INTERNAL_SYSCALL (stat64, err, 2, file, st);
+  if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
+    return result;
+
+  errno_out = INTERNAL_SYSCALL_ERRNO (result, err);
+  __atfct_seterrno (errno_out, fd, buf);
+
+  return -1;
+}
+libc_hidden_def (__fxstatat)
+strong_alias (__fxstatat, __fxstatat64);
+libc_hidden_ver(__fxstatat, __fxstatat64);