web.go is not compatible with spawn-fcgi

[hoisie]

Reported by Alexey Zilber:

Running a web.go app with spawn-fcgi doesn't work:

sudo -u lighttpd spawn-fcgi -f /path/to/app -a localhost -p 8803

spawn-fcgi.c.230: child exited with: 0

In this case, as far as I know, web.go should read from stdin and write to stdout