Log Message:
Update to 1.13.3:

libgsf 1.13.3

J.H.M. Dassen (Ray) :
	* Improve documentation.

Jody :
	* More work on extension interface to sax import wrapper.

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libgsf 1.13.0

Jody:
	* API changes SAX wrappers for help OpenDoc and SpreadsheetML.

Kasal:
	* Improve libtool versioning.
	* Relax the gconf requirement.

Luciano Wolf:
	* OpenDocument meta stream parser.

Sven Herzberg:
	* Fix for GsfOutputGnomeVFS

API change with shlib major change -> BUILDLINK_DEPENDS bumped.