Windows port merge - Various fixes [PATCH]

Hi,

This is the 7th of some splitted native Windows patches grouped by
functionality.

Native Windows port enhancements:

- client_side_reply.cc: MS Visual C++ compatibility fix
- comm.cc: ioctl() and fnctl() handling
- defines.h: New Windows specific defines
- globals.h: New Windows specific global variables
- main.cc and tool.cc: Isolated unsupported code functions (signal, fork,
child)
- net_db.cc: netdb_state file must be opened in binary mode
- protos.h: New Windows specific function prototypes
- squid.h: min() and max() are already defined in Windows

Regards

Guido

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Serassio Guido
Via Albenga, 11/4 10134 - Torino - ITALY
E-mail: guido.serassio@serassio.it
WWW: http://www.serassio.it