Submitted by: @hvlad

Relate to CORE4653

We have SEH exceptions handler and convert EXCEPTION_STACK_OVERFLOW into our C++ exception.
This C++ exception correctly handled by our catch blocks.
But there is not call of _resetstkoflw() after error recovery therefore stack have no guard page after initial stack overflow and subsequent stack overflow lead to AV.

See for details: http://msdn.microsoft.com/en-us/library/89f73td2.aspx

Commits: 20bae96 FirebirdSQL/fbt-repository@d0b1d29