Code review comment for lp:~mixxxdevelopers/mixxx/features_m4a_win7

And for my last bit of spam for the moment, soundsource plugins allocate a array of cstrings which are then filled and returned to the caller (SoundSourceProxy), which then owns the memory and must free it; this is how plugins communicate the file name extensions of the respective file types they support. I tried using the plugin I built with my branch with the 1.9 distribution (figured I could post a link to it to mixxx-devel for people to try out) and it's failing because of this malloc/free across dll boundaries (different msvcrt versions linked between mixxx.exe and soundsourcemediafoundation.dll). IMO the plugin API needs to be modified such that it frees its own memory (and stupid stuff like this is why I don't really want to deal with plugins).