let `uscan --debug` print mangled uversions

[Markus Wanner]

Hi,

fiddling with the watch file for 'asio', I recently found myself wanting
to check my uversionmangle pattern. However, uscan --debug didn't show
me the effects of my regexp.

With the attached simple patch, uscan lists the mangled version
determined from the upstream file (in braces). Provided on a "works for
me" basis, not much testing performed.

Regards

Markus Wanner
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