Windows port merge - MS Visual C++ compatibility [PATCH]

Hi,

This is the 6th of some splitted native Windows patches grouped by
functionality.

Native Windows port enhancements:

- C++ fixes for MS Visual C++ compatibility, See this old squid-dev thread
about:
http://www.squid-cache.org/mail-archive/squid-dev/200211/0249.html
- Some casting and prototypes fixes
- some little DNS sources changes for a better build process using MS
Visual Studio.

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