minor code cleanups in metaclass utility code, fix compiler warning about unused function __Pyx_Py3MetaclassGet()
minor code cleanups in metaclass utility code, fix compiler warning about unused function __Pyx_Py3MetaclassGet()

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