FD_SETSIZE for Windows

I have not pinpointed the problem, but I have been experiencing
moments where Polipo on Windows will hang. This coincided with many
open connections. I disabled gethostbyname thinking it could be the
DNS resolver. That did not help. After reading more about using select
and FD_ related macros under Windows, I found that select will only
handle 64 connections by default. Under Linux, the limit is usually
1024.

By defining FD_SETSIZE to 1024 prior to including winsock2.h, this
limitation is removed.

I added the following in mingw.h:

#define FD_SETSIZE 1024

before

#include <winsock2.h>


This seems to have resolved the issue I had with connections hanging
when Polipo had a lot of open connections. This is the biggest
improvement I have seen of all the changes I have tried.

Thanks,
Gabe

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