build_hacking.xml: Use relative fileref for PNG imagedata.

2011-08-04  Benjamin Kosnik  <bkoz@redhat.com>

	* doc/xml/manual/build_hacking.xml: Use relative fileref for PNG
	imagedata.
	* doc/xml/manual/test_policy_data_structures.xml: Same.
	* doc/xml/manual/policy_data_structures.xml: Same.

	* doc/Makefile.am (stamp-html-docbook-images)
	(stamp-html-docbook-lwg, stamp-html-docbook-data): New.
	(xml_extra): Add lwg html file dependencies.
	(xml_images): Add image html file dependencies.
	* doc/Makefile.in: Regenerate.
	(stamp-html): Change to stamp-html-docbook-data.
	(stamp-html-copy): Remove.

From-SVN: r177418