the methods SWIG_Ruby_ConvertPtrAndOwn and SWIG_Ruby_NewPointerObj,
now tracking information is held on swig_class. This change reduces
significantly reduces the amount of code needed in ruby.cxx, is more robust, and is
more cohesive.
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@8082 626c5289-ae23-0410-ae9c-e8d60b6d4f22