Some math.h fixes, c99 isX macros.
Some math.h fixes, c99 isX macros.

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