fix warning about C++ char* literal conversion
fix warning about C++ char* literal conversion

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