Add safety cast in queue tutorial code that avoids casting a potentially non-pointer-sized "int" to a "void*".
Add safety cast in queue tutorial code that avoids casting a potentially non-pointer-sized "int" to a "void*".

cython/cython,cython/cython,da-woods/cython,scoder/cython,da-woods/cython,cython/cython,scoder/cython,da-woods/cython,scoder/cython,scoder/cython,da-woods/cython,cython/cython