Log Message:
Add SCRIPT_FILENAME to the environment variables provided to CGIs,
as a copy of SCRIPT_NAME with the leading `/' removed.
Note that SCRIPT_FILENAME is  _not_  a CGI/1.1 environment variable per
	http://cgi-spec.golux.com/

If SCRIPT_FILENAME is not set set PHP 4.3.6 as a CGI fails with
	No input file specified.
Apache sets this variable; it appears that many other CGI/1.1 compliant
web servers do not and thus PHP 4.3.6 as a CGI doesn't function with them.
"oh joy."