Remove unnecessary "head" arguments from some dlist/slist functions.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: dc5aeca168629183e64087b1147d3c2645e49ddc
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2012-10-18T23:04:20Z
Releases: 9.3.0
Remove unnecessary "head" arguments from some dlist/slist functions.

dlist_delete, dlist_insert_after, dlist_insert_before, slist_insert_after
do not need access to the list header, and indeed insisting on that negates
one of the main advantages of a doubly-linked list.

In consequence, revert addition of "cache_bucket" field to CatCTup.

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