fix C warnings about unused string constants
fix C warnings about unused string constants

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