* Detect CGI configurations where PATH_INFO is set up correctly.

* Detect CGI configurations where PATH_INFO is set up correctly.
  PHP config var cgi.fix_pathinfo isn't detectable through ini_get(), but
  we can find some side-effects. Only tested on lighttpd so far, hopefully
  right on Apache too!

lighty documentation says you have to use the "broken-scriptfilename" => "enable"
option on lighty fast-cgi config, plus set cgi.fix_pathinfo to make it work.
I've found that cgi.fix_pathinfo is on by default in current PHP (tested 5.2.0),
and I don't seem to have to change the defaults on lighty either.