awk macro: move expander values into compile-time struct.

* share/txr/stdlib/awk.tl (sys:awk-compile-time): New
slots: inputs, output, name, lets, begin-actions,
end-actions, cond-actions.
(sys:awk-expander): Use just one local variable,
an awk compile time. Instead of the previous local
variables, use the slots of this structure and
return just that structure. Note that pattern-actions
has been renamed cond-actions. This is per the terminology
used in the newly-written documentation.
(awk): Adjust to sys:awk-expander returning just the
awk compile-time structure. No need to set up numerous
locals; just refer to struct.

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