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* Sort linked list in place.
* - get_next_fn() returns the next element given an element of a linked list.
* - set_next_fn() takes two elements A and B, and makes B the "next" element
* of A on the list.
* - compare_fn() takes two elements A and B, and returns negative, 0, positive
* as the same sign as "subtracting" B from A.
void *llist_mergesort(void *list,
void *(*get_next_fn)(const void *),
void (*set_next_fn)(void *, void *),
int (*compare_fn)(const void *, const void *));