ntdll: Reduce stack usage of virtual memory functions by storing sigset in static memory.

[Michael Müller]

Am 27.09.2015 um 00:07 schrieb Sebastian Lackner:
> From: Michael Müller <michael at fds-team.de>
> 
> For https://bugs.winehq.org/show_bug.cgi?id=34558
> 
> Depending on the compiler optimization flags there is still no guarantee that
> everything will fit into the available stack space, no matter if its declared
> as static or not.

As suspected the idea does not work for all optimization levels. At
least GCC merges the content of the functions when using -O2 and
therefore reintroduces the problem - even __attribute__ ((noinline)) is
not sufficient.

As most distributions compile Wine with -02, I would suggest to ignore
the patch for now. Maybe we can come up with a more general solution.