[fpc-pascal] Windows GetLastError doesn't work with threads

[Luca Olivetti]

I hate to be obnoxious, but I posted a patch for the issue in the 
subject (WSAGetLastError/GetLastError is reset by the rtl when one is 
using threads) and I'd like some feedback (if it's the proper solution 
or is there a better one).

http://bugs.freepascal.org/view.php?id=10205

Bye
-- 
Luca