PATCH: CygWin port enhancement

Hi,

This patch allows squid to use the hosts file from the right Windows
directory when /etc/host is not found.
The same stuff can be make in squid.conf, but with this patch the things
are automatic at runtime, so multi boot installations can be more easily
supported.
Works on all WIN32 platforms.

Other changes:

- Better GetOSVersion function, more squid "aware".
- Fixed compile warning in comm.c
- Changed exit() WIN32 hook, now less intrusive

Can it please go into HEAD? Everything is #ifdef'd or otherwise protected.

Guido

-
=======================================================
Serassio Guido
Via Albenga, 11/4 10134 - Torino - ITALY
Tel. : +39.011.610749
E-mail: serassio@interfree.it
         serassio@libero.it
WWW: http://www.serassio.it