The list(xrange(sys.maxint / 4)) test blew up on 64-bit platforms.

Because ob_size is a 32-bit int but sys.maxint is LONG_MAX which is a
64-bit value, there's no way to make this test succeed on a 64-bit
platform.  So just skip it when sys.maxint isn't 0x7fffffff.

Backport candidate.