[PATCH] - New WIN32 hosts file code

Hi,

This is the new code for hosts file handling on Windows platforms, plus a
new enhancement on GetOSVersion().

I introduced a new default value for hosts_file option on squid.conf:
$SYSNETDB/hosts.

When hosts_file has this value, the host file is automatically searched on
the default OS location:

- Un*X: /etc/hosts
- Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts (%SystemRoot%
value install default is c:\winnt)
- Windows 9x/Me: %windir%\hosts (%windir% value is usually c:\windows)
- Cygwin: /etc/hosts and, if not found here, Windows default

The code was tested successfully on Cygwin and Linux Alpha.

I think that can go on HEAD, but comments are welcome.

Guido

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Serassio Guido
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