[poppler] [PATCH] add new overload for PDFDoc::saveAs()

[Pino Toscano]

Hi,

while working on the Qt4 frontend, I noticed the newly created 
PDFDoc::saveAs() can save only to file (whose name is specified as 
parameter).
Though, what it really does is creating a FileOutStream and saving to that 
stream. As using an output stream directly could be useful for the Qt4 
frontend, I did the following patch (sadly not tested).

Comments? Blamings? Commit (since I'm still waiting for the account)?
-- 
Pino Toscano
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