[pdftohtml] Bugfix: Remove spans in XML output

[Holger B. <hol...@bl...>]

When in XML mode, do not output font spans. (Done in HtmlFonts.cc but 
apparently forgotten in HtmlOutputDev.cc.) Otherwise the XML is 
not valid when e.g. a table is encountered that has different 
fonts in its cells, example: page Table E-29, "Simplified Mnemonics", 
of Freescale Semiconductor, "Programming Environments Manual for 32-Bit 
Implementations of the PowerPC Architecture, Rev. 3" (I have seen this 
also in a completely unrelated document, so this is not rare
Another report of this bug (by sb else) is at: 
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415764
).

Patch see attached (against version 0.40). 


-- 
Holger Blasum 
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