[PATCH:xhost] Drop pre-POSIX signal handling support in favor of sigaction()

[Julien Cristau]

On Sat, Feb 23, 2013 at 09:53:48 -0800, Alan Coopersmith wrote:

> X_NOT_POSIX has never been defined by our autoconf scripts, only the
> old Imake configuration, so this doesn't seem to have been needed in years.
> 
<X11/Xosdefs.h> seems to define it in some cases.  Possibly not cases
anyone cares about anymore though.

Cheers,
Julien