ntdll: use SIGSTKSZ in sigaltstack instead of depending on size_t

[Austin English]

On Sun, Feb 28, 2010 at 7:04 PM, Austin English <austinenglish at gmail.com> wrote:
> OpenBSD complains about this, giving 'sigaltstack: invalid argument'
> on every run (4 times). This cuts out 3 of them. Still chasing down
> the last one...
>
> Tested on Linux as well, and google seems to indicate this should work
> on the BSD's and Solaris, so should be pretty portable.
>
> If an #ifdef is preferred, please let me know and I'll resend.

Please ignore this patch. Seems the failures are sporadic, so I'm not
sure this is helping.

-- 
-Austin