use potentially platform optimised memchr() in utility function instead of hand written for-loop
use potentially platform optimised memchr() in utility function instead of hand written for-loop

cython/cython,c-blake/cython,scoder/cython,scoder/cython,da-woods/cython,cython/cython,scoder/cython,c-blake/cython,da-woods/cython,cython/cython,fabianrost84/cython,fabianrost84/cython,fabianrost84/cython,scoder/cython,fabianrost84/cython,c-blake/cython,da-woods/cython,c-blake/cython,ChristopherHogan/cython,ChristopherHogan/cython,cython/cython,ChristopherHogan/cython,c-blake/cython,fabianrost84/cython,da-woods/cython