Fixed __Pyx_sst_abs with C++11
Fixed __Pyx_sst_abs with C++11

Some compilers appear to require you to explicitly `#include <cstdlib>` before
providing `std::abs`.

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