fix ref-leak in Py2 metaclass support
fix ref-leak in Py2 metaclass support

encukou/cython,cython/cython,ABcDexter/cython,rguillebert/CythonCTypesBackend,marscher/cython,bzzzz/cython,dahebolangkuan/cython,madjar/cython,hickford/cython,larsmans/cython,cython/cython,roxyboy/cython,andreasvc/cython,andreasvc/cython,fperez/cython,fabianrost84/cython,JelleZijlstra/cython,hickford/cython,slonik-az/cython,fabianrost84/cython,achernet/cython,da-woods/cython,larsmans/cython,bzzzz/cython,dahebolangkuan/cython,encukou/cython,mcanthony/cython,mrGeen/cython,ABcDexter/cython,ChristopherHogan/cython,hickford/cython,slonik-az/cython,roxyboy/cython,hickford/cython,c-blake/cython,hickford/cython,acrispin/cython,ABcDexter/cython,fperez/cython,bzzzz/cython,madjar/cython,achernet/cython,fperez/cython,ABcDexter/cython,da-woods/cython,fabianrost84/cython,slonik-az/cython,mrGeen/cython,encukou/cython,c-blake/cython,fperez/cython,ChristopherHogan/cython,JelleZijlstra/cython,marscher/cython,hhsprings/cython,acrispin/cython,mcanthony/cython,roxyboy/cython,c-blake/cython,larsmans/cython,hpfem/cython,andreasvc/cython,dahebolangkuan/cython,hpfem/cython,andreasvc/cython,ChristopherHogan/cython,hhsprings/cython,slonik-az/cython,acrispin/cython,ABcDexter/cython,mrGeen/cython,JelleZijlstra/cython,madjar/cython,rguillebert/CythonCTypesBackend,scoder/cython,marscher/cython,bzzzz/cython,mcanthony/cython,hpfem/cython,mcanthony/cython,scoder/cython,hhsprings/cython,madjar/cython,achernet/cython,hpfem/cython,JelleZijlstra/cython,roxyboy/cython,dahebolangkuan/cython,marscher/cython,larsmans/cython,c-blake/cython,scoder/cython,JelleZijlstra/cython,acrispin/cython,da-woods/cython,mrGeen/cython,achernet/cython,fabianrost84/cython,encukou/cython,rguillebert/CythonCTypesBackend,dahebolangkuan/cython,rguillebert/CythonCTypesBackend,achernet/cython,hpfem/cython,mcanthony/cython,slonik-az/cython,madjar/cython,c-blake/cython,acrispin/cython,hhsprings/cython,scoder/cython,fabianrost84/cython,roxyboy/cython,cython/cython,hhsprings/cython,marscher/cython,encukou/cython,andreasvc/cython,da-woods/cython,larsmans/cython,fperez/cython,cython/cython,mrGeen/cython