Relocate AArch64 from ports to libc.

This patch moves the AArch64 port to the main sysdeps hierarchy.  The
move is essentially:

  git mv ports/sysdeps/aarch64 sysdeps/aarch64
  git mv ports/sysdeps/unix/sysv/linux/aarch64 sysdeps/unix/sysv/linux/aarch64

The README is updated and I've updated ChangeLog.aarch64 along the
lines of the ARM move.  The AArch64 build has been tested to confirm
that there were no changes in objdump -dr output or the shared
objects.

1 files changed, 0 insertions, 56 deletions

diff --git a/ports/sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h b/ports/sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h
deleted file mode 100644
index 476f5debbf..0000000000
--- a/ports/sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h
+++ /dev/null
@@ -1,56 +0,0 @@
-/* Copyright (C) 1998-2014 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/>.  */
-
-/* System V/AArch64 ABI compliant context switching support.  */
-
-#ifndef _SYS_UCONTEXT_H
-#define _SYS_UCONTEXT_H	1
-
-#include <features.h>
-#include <signal.h>
-#include <sys/procfs.h>
-
-/* We need the signal context definitions even if they are not used
-   included in <signal.h>.  */
-#include <bits/sigcontext.h>
-
-typedef int greg_t;
-
-/* Container for all general registers.  */
-typedef elf_gregset_t gregset_t;
-
-/* Structure to describe FPU registers.  */
-typedef elf_fpregset_t	fpregset_t;
-
-/* Context to describe whole processor state.  This only describes
-   the core registers; coprocessor registers get saved elsewhere
-   (e.g. in uc_regspace, or somewhere unspecified on the stack
-   during non-RT signal handlers).  */
-typedef struct sigcontext mcontext_t;
-
-/* Userlevel context.  */
-typedef struct ucontext
-  {
-    unsigned long uc_flags;
-    struct ucontext *uc_link;
-    stack_t uc_stack;
-    __sigset_t uc_sigmask;
-    mcontext_t uc_mcontext;
-  } ucontext_t;
-
-#endif /* sys/ucontext.h */