Avoid call of SetupThreads in DatabasePager 
Avoid call of SetupThreads in DatabasePager 

This solves a bug with some shared library configurations. Sometimes the DatabasePager Singleton is initialised before one can call other configuration options like "setNumOfDatabaseThreadsHint". But OSG initialise it here:

https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgDB/DatabasePager.cpp#L1555 

So this call is not needed?!
jtorresfabra/osg,scrawl/osg,openscenegraph/osg,jtorresfabra/osg,openscenegraph/osg,openscenegraph/osg,scrawl/osg,scrawl/osg,scrawl/osg,jtorresfabra/osg,openscenegraph/osg,jtorresfabra/osg