defstruct: order function slots before other static slots.

This allows the initializer expressions for static slots
to instantiate objects, and those instances can rely on
methods being set up.

* share/txr/stdlib/struct.tl (sys:prune-nil-inits): Recognize
:function keyword as denoting a static slot.
(defstruct): Represent methods and functions as (:function
...) items rather than (:static ...) so they can be
distinguished. Function slots appear before other static
slots in the static slot list, and their initializing
code is placed into the the static-initfun lambda of the
sys:make-struct-type call in this order.

* txr.1: Documented.

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