Cygwin lacks icmp support - pinger.c PATCH

Hi,

Today I discovered why nobody asked before to fix the pinger.exe build
problem on Cygwin:

Simply, Cygwin lacks include files for icmp: the netinet/ip_icmp.h files is
empty ....
http://sources.redhat.com/ml/cygwin/2001-07/msg00889.html

So I have just adapted the Windows native port changes in pinger.c to
compile and run on Cygwin too.

In the attached patch file there is a full Windows update of pinger.c,
supporting both _SQUID_CYGWIN_ and _SQUID_MSWIN_ environments.

IMO this can go in HEAD and 2.5.

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