Build warnings libxfce4mcs, xfce4-mixer, xfwm4, xfce4-panel and xfce4-session

[Olivier Fourdan]

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Nick Schermer wrote :
> Here are a couple of fixes for various build warnings in the latest
> trunk. (I'm not going to open bug reports for each of them, that's why
> I'm using the mailing list).
> I know they are all harmless, but he we were making Xfce 4.4 the best
> Xfce release ever :-).

Done for xfwm4 and libxfce4mcs. I'll let benny, jasper and
danny review and apply the others patches in their respective modules :)

Thanks,
- --
   - Olivier
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