To allow a using of Tcl scripts in CGI

[Anthony Tonizzo]

Sergey:

The only objection I have to this patch is this:

> +#ifdef CYGOPT_NET_ATHTTPD_USE_CGIBIN_TCL
> +#include <cyg/athttpd/jim.h>
> +#endif

This is already done in http.h and I am not sure why you want to
do it again in cgi.c

Tony