Get rids of pthread dependency on Windows
Get rids of pthread dependency on Windows

viblo/Chipmunk2D,slembcke/Chipmunk2D,kennethdmiller3/Chipmunk-Physics,kennethdmiller3/Chipmunk-Physics,kennethdmiller3/Chipmunk-Physics,slembcke/Chipmunk2D,viblo/Chipmunk2D,viblo/Chipmunk2D,slembcke/Chipmunk2D,kennethdmiller3/Chipmunk-Physics,viblo/Chipmunk2D