ntdll: try to not raise exceptions when checking for atl thunks

[Markus Amsler]

This fixes a regression with Shrinker 3.x compressed executables (like 
bug 2608).
Shrinker injects its own exception handler into ntdll.EXC_CallHandler. 
If there's an exception in check_atl_thunk shrinkers expected exceptions 
gets out of sync which results in a page fault.

I tried writing a test to test how windows checks for atl thunks, but 
windows is quite paranoid with emulating atl thunks (see code comments). 
So I don't think its worth the effort to write a test for windows 
behaviour, which wine has pretty sure no need to replicate.
---
  dlls/ntdll/signal_i386.c |   19 +++++++++++++++++++
  1 files changed, 19 insertions(+), 0 deletions(-)


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