Constify the arguments of ilist.c/h functions

Const qualifiers ensure that we don't do something stupid in the
function implementation.  Additionally they clarify the interface.  As
an example:

    void
    slist_delete(slist_head *head, const slist_node *node)

Here one can instantly tell that node->next is not going to be set to
NULL.  Finally, const qualifiers potentially allow the compiler to do
more optimizations.  This being said, no benchmarking was done for
this patch.

The functions that return non-const pointers like slist_next_node(),
dclist_next_node() etc. are not affected by the patch intentionally.

Author: Aleksander Alekseev
Reviewed-by: Andres Freund
Discussion: https://postgr.es/m/CAJ7c6TM2%3D08mNKD9aJg8vEY9hd%2BG4L7%2BNvh30UiNT3kShgRgNg%40mail.gmail.com

src/backend/lib/ilist.c

@@ -28,7 +28,7 @@
  * Caution: this is O(n); consider using slist_delete_current() instead.
  */
 void
-slist_delete(slist_head *head, slist_node *node)
+slist_delete(slist_head *head, const slist_node *node)
 {
 	slist_node *last = &head->head;
 	slist_node *cur;
@@ -57,7 +57,7 @@ slist_delete(slist_head *head, slist_node *node)
  *		Validate that 'node' is a member of 'head'
  */
 void
-dlist_member_check(dlist_head *head, dlist_node *node)
+dlist_member_check(const dlist_head *head, const dlist_node *node)
 {
 	dlist_iter	iter;
 
@@ -73,7 +73,7 @@ dlist_member_check(dlist_head *head, dlist_node *node)
  * Verify integrity of a doubly linked list
  */
 void
-dlist_check(dlist_head *head)
+dlist_check(const dlist_head *head)
 {
 	dlist_node *cur;
 
@@ -110,7 +110,7 @@ dlist_check(dlist_head *head)
  * Verify integrity of a singly linked list
  */
 void
-slist_check(slist_head *head)
+slist_check(const slist_head *head)
 {
 	slist_node *cur;