Comment 1 for bug 610746

This patch fixes it. Basically, in rev 2467 (1.8 branch, same change happened at 2432 in trunk), the SConscript for the m4a plugin lost instruction to build soundsource.cpp with soundsourcem4a.cpp, and it's apparently needed to subclass (makes since, since the getCuePoint method the error talks about would be public on soundsourcem4a too). In order for the m4a sconscript to get at the soundsource.cpp file in src directory, I had to add a VariantDir SCons instruction right before the SConscript call to the plugins SConscript, which basically tells scons that, if it can't find a file while looking in plugins/soundsourcem4a, look in src/. This would have to be repeated for any other plugins that came along -- sucks, but I really couldn't find a way around it. SConscript() does take an argument variant_dir, but it was making everything go fubar for me.