[poppler] pdftohtml: add version of poppler to the XML output

Sun Apr 1 02:57:59 PDT 2012

Add version to produced XML file.

In case somebody tries to change/improve the XML output format,
version should at least give some guidance as to how parse the thing.
Also, poppler's pdf2xml is pretty much only one which doesn't add some
version information to the XML generated.

Patch attached.
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