gf-server: make pgf-service work the Apache mod_fastcgi

pgf-service now appears to works with Apache mod_fastcgi (under Mac OS X) in
addition to lighttpd.

One difference appears to be that while lighttpd passes the name of the PGF
file in the SCRIPT_FILENAME variable, Apache passes it in PATH_TRANSLATED.
But perhaps this depends on exactly how the fastcgi service is configured.
The following is what I added to the Apache configuration file to test this:

	<Directory /Library/WebServer/Documents/fcgi-bin>
	  SetHandler fastcgi-script
	  Options +ExecCGI
	</Directory>
	Action pgf-service /fcgi-bin/pgf-service
	AddHandler pgf-service .pgf

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