setup.py: Use setuptools when invoked with bdist_{egg,wheel}.
setup.py: Use setuptools when invoked with bdist_{egg,wheel}.

This makes it easier to build eggs and wheels of 0.19.x releases; the
master branch already uses setuptools.

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