Clarify posix typedef declarations.
Clarify posix typedef declarations.

fperez/cython,hhsprings/cython,mcanthony/cython,hhsprings/cython,fabianrost84/cython,mrGeen/cython,cython/cython,hickford/cython,fperez/cython,scoder/cython,hickford/cython,fperez/cython,JelleZijlstra/cython,hhsprings/cython,da-woods/cython,c-blake/cython,acrispin/cython,ChristopherHogan/cython,acrispin/cython,mrGeen/cython,da-woods/cython,mrGeen/cython,JelleZijlstra/cython,fperez/cython,cython/cython,scoder/cython,cython/cython,ChristopherHogan/cython,acrispin/cython,mrGeen/cython,fperez/cython,ChristopherHogan/cython,acrispin/cython,fabianrost84/cython,cython/cython,scoder/cython,hhsprings/cython,fabianrost84/cython,fabianrost84/cython,mcanthony/cython,hickford/cython,scoder/cython,JelleZijlstra/cython,JelleZijlstra/cython,mcanthony/cython,fabianrost84/cython,hickford/cython,hhsprings/cython,da-woods/cython,c-blake/cython,mcanthony/cython,c-blake/cython,c-blake/cython,mrGeen/cython,hickford/cython,JelleZijlstra/cython,mcanthony/cython,c-blake/cython,acrispin/cython,da-woods/cython