Add macros for linked list operations.

Mostly in preparation to the pending thread-safe list macros. This way,
we have a similar interface to thead-safe and non-thread-safe lists.

This also adds LLIST_FOREACH and LLIST_FIND_FOREACH macros which can be
used as shortcuts when iterating over all list items or a subset of list
items that is accepted by a callback function.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

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