Removed the building of the osgTXP library so the build system builds only the plugin.  Building both the plugin and the library causes a race condition during parallel makes.
Removed the building of the osgTXP library so the build system builds only
the plugin.  Building both the plugin and the library causes a race condition
during parallel makes.


artoolkit/osg,artoolkit/osg,koshman86/osg,XiaoCC/osg,XiaoCC/osg,ntoand/osg,stmh/osg,stmh/osg,ghub/osg,ghub/osg,omega-hub/osg,ntoand/osg,artoolkit/osg,XiaoCC/osg,XiaoCC/osg,koshman86/osg,koshman86/osg,XiaoCC/osg,omega-hub/osg,stmh/osg,koshman86/osg,artoolkit/osg,ghub/osg,ntoand/osg,omega-hub/osg,ntoand/osg,omega-hub/osg,ghub/osg,stmh/osg,stmh/osg