add missing slots 'tp_del' (Py>=2.3) and 'tp_version_tag' (Py>=2.6)
add missing slots 'tp_del' (Py>=2.3) and 'tp_version_tag' (Py>=2.6)

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