fix subclassing non-GC types like 'unicode'
fix subclassing non-GC types like 'unicode'

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