Residual Windows port merge [PATCH]

Hi,

These are 2 residual Windows port merge patches:

- main.cc: On Windows signal() can't be used for debugging purpose: added
support for native debug
- comm.cc: On Windows dup2() can't work correctly on Sockets, the work
around is to close the destination socket before call them.

Regards

Guido

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Guido Serassio
Acme Consulting S.r.l.
Via Gorizia, 69 10136 - Torino - ITALY
Tel. : +39.011.3249426 Fax. : +39.011.3293665
Email: guido.serassio@acmeconsulting.it
WWW: http://www.acmeconsulting.it/