*puts Upstream Developer hat on* Rhythmbox Applet 0.1.8 is going to be released Real Soon Now (i.e., once its translators have a chance to update their .po files), and it includes a fix for this bug. In the meantime, I can confirm that the patch fixes the problem, and I have already made the same change to the Arch repository.
The next release of RBA has a few build system changes that should help prevent it from breaking like this when the libraries it uses get upgraded. I've learned that disabling deprecated APIs and treating compiler warnings as errors work well for development, but not for a released tarball that people just want to compile. :-)
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