`Mute sounds` broken in Pidgin-2.5.4-win32

[Chris Forbes]

Hi,

I'm running Pidgin-2.5.4 on Windows Vista Business, and noticed that the 
muting is / has recently got broken.
I have `Tools->Mute Sounds` ticked, yet I still get sounds from Pidgin, at 
least on connect/disconnect.

This is not cool.

Temporary workaround is to kill Pidgin's sound output through the Windows 
per-app volume controls, but I'd rather your app would just shut up when 
asked to.

Thank you very much,

Chris Forbes
chrisf at ijw.co.nz