Fix crash on undeclared builtin
Fix crash on undeclared builtin

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