Sync wininet with Wine. This fixes the Download! issue.

Sync wininet with Wine. This fixes the Download! issue.

As we implement some more functions in the network stack now, I could remove some hacks from the "wininet_ros.diff" file.
Anyways, the following things still needed to be changed:
- Pass a variable to WriteFile for receiving the number of bytes written. This parameter is not checked for NULL in ReactOS and Windows, when lpOverlapped is also NULL.
  I'll submit a patch about this to Wine as well.
- Replace Unix poll() calls by equivalent select() calls
- Bypass sock_get_error(), directly call WSAGetLastError() as we don't have to translate Unix socket errors.

See issue #3197 for more details.

svn path=/trunk/; revision=33788