Function r_long64

r_long64 deals with the TYPE_INT64 code. On a machine with sizeof(long) > 4, it returns a Python int object, else a Python long object. Note that w_long64 writes out TYPE_INT if 32 bits is enough, so there's no inefficiency here in returning a PyLong on 32-bit boxes for everything written via TYPE_INT64 (i.e., if an int is written via TYPE_INT64, it *needs* more than 32 bits). */