tags: grok Lisp definitions inside @(do ...).

* tags.tl (unexpand): New function.
(process-clause): Walk the forms enclosed in a @(do ...)
directive that appears at the top level. Because all Lisp is
macro-expanded right inside the TXR parser, we need to
"unexpand" the forms by chasing their macro-ancestor
chain, gaining access to the original forms like defun
and defstruct. We can then turn these forms into tags using
the process-form function.

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