Bug fixes + possible symbols update for qt4-x11

[Lisandro Damián Nicanor Pérez Meyer]

Hi everyone! I have commited some changes to qt4-x11 in order to solve bugs 
#679874 (Qt assistant segfault on start, RC) and #681476 (add a simple patch 
to fix use after free).

I have compiled and tested the changes and everything seems OK:

I was thinking on building+uploading+asking for freeze unblock for it. But it 
could be a good moment to check for symbols changes, so I followed the team's 
note and got: <http://paste.debian.net/180305/>

I wonder why libqt4-network.symbols libqt4-script.symbols have their symbols 
only confirmed for s390 :-/

So the questions would be:

- Should I updatethe symbols files? Should I do/change anything wrt them? 
(Note that there are some missing symbols).
- Does anyone want to check/do more changes in qt4-x11 before the upload? Are 
there any problems in doing so?

Kinds regards, Lisandro.

-- 
"I'm your worst nightmare".
  Eric S. Raymond to Craig Mundie

Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/
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