From Stephane Simon, added missing OSGDB_EXPORT to osgDB::openArchive functions
From Stephane Simon, added missing OSGDB_EXPORT to osgDB::openArchive functions


marchelbling/osg,artoolkit/osg,jtorresfabra/osg,jtorresfabra/osg,artoolkit/osg,jtorresfabra/osg,artoolkit/osg,tomasthoresen/osg,openscenegraph/osg,tomasthoresen/osg,artoolkit/osg,openscenegraph/osg,scrawl/osg,scrawl/osg,openscenegraph/osg,marchelbling/osg,scrawl/osg,scrawl/osg,marchelbling/osg,jtorresfabra/osg,openscenegraph/osg,tomasthoresen/osg,tomasthoresen/osg,marchelbling/osg