[PATCH libX11] Add an "X11_" string to header guards to avoid possible collision

[Dan Nicholson]

On Sun, Sep 26, 2010 at 9:25 PM, Jeremy Huddleston
<jeremyhu at freedesktop.org> wrote:
> This addresses a build failure which can result from <X11/Xlocale.h> and
> <xlocale.h> being included in the same code since they both used the same
> _XLOCALE_H_ protection.
>
> Signed-off-by: Jeremy Huddleston <jeremyhu at apple.com>

Looks reasonable to me.

Reviewed-by: Dan Nicholson <dbn.lists at gmail.com>