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, 12 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/aarch64/Versions b/sysdeps/unix/sysv/linux/aarch64/Versions
new file mode 100644
index 0000000000..9bd87fe2d0
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/Versions
@@ -0,0 +1,12 @@
+ld {
+  GLIBC_PRIVATE {
+    # used for loading by static libraries
+    _dl_var_init;
+  }
+}
+libc {
+  GLIBC_PRIVATE {
+    __vdso_clock_gettime;
+    __vdso_clock_getres;
+  }
+}