auxv: Restore backward compatibility

In commit 459828b6 I suddenly broke backward
compatibility of auxv vector on 32bit machines.
Bring it back.

Reported-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Remove \u and \U GNU-isms from sed command

This allows building with busybox sed, for example.

Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>