X_DEPRECATED versus _ X_DEPRECATED

[Jeremy Huddleston]

I just noticed that misc.h now has X_DEPRECATED and X_NORETURN ... why are we duplicating these?  Why not just use the ones from xproto?

commit 7dde50c649089b03650d6497079a690feea65e22
Author: Keith Packard <keithp at keithp.com>
Date:   Thu Apr 29 12:24:47 2010 -0700

    Move X_DEPRECATED to misc.h so it can be used outside resource.h
    
    Signed-off-by: Keith Packard <keithp at keithp.com>
    Reviewed-by: Jamey Sharp <jamey at minilop.net>