Avoid using abs with arbitrarily-sized ints.
Avoid using abs with arbitrarily-sized ints.

Here the residue always fits into an int.  This fixes #1721.

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