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These only show up in oldnumeric when 2to3 with the 2to3 renames and nonzero fixers. The replacement for sys.maxint in python3 is sys.maxsize, but the two aren't the same, the latter the size of Py_ssize_t. Likewise the the replacement for __nonzero is __bool__, but anyone using old numeric is likely to have made the change.
Because oldnumeric will go away, I suggest we leave those attributes unchanged and advertize that oldnumeric isn't supported in python 3.
That sounds like a good idea to me.
Messes up the tests, though. The import fails for python3 and the tests end. Might be able to slip a warning through. I tried this a while ago, so I'm a bit hazy on the details of the result.
Given that no issues have been raised since Python 3 compatible Numpy 1.5, and that the oldnumeric package is reaching end of life, I made the sys.maxsize substitution for Python >= 3 and added a __bool__ method that duplicates the current __nonzero__ method. So closing this.