Fixes for IRIX build.

Updates to the osg::Transform, adding preMult and postMult methods and
deprecating the old preRotate,preTranslate,preScale.

Updated the rest of the OSG so that it nolonger uses the deprecated
osg::Transform nodes.

Renamed osgUtil::SceneView::setGlobalState() to
osgUtil::SceneView::setGlobalStateSet() so that the name reflects its
functionality better.  Updated osgGLUT::Viewer etc to cope with new
name change.

src/osgPlugins/obj/ReaderWriterOBJ.cpp

@@ -157,7 +157,7 @@ osgDB::ReaderWriter::ReadResult ReaderWriterOBJ::readNode(const std::string& fil
 		// note obj_x -> osg_x,
 		//      obj_y -> osg_z,
 		//      obj_z -> osg_y,
-        xform->preTranslate(obj->position[0], obj->position[2], obj->position[1]);
+        xform->setMatrix(osg::Matrix::trans(obj->position[0], obj->position[2], obj->position[1]));
         osg_top = xform;
     }
     else