As noted in a recent PR (port-i386/3332) the Linux sound emulation
isn't complete enough to use the Real Audio player (raplayer) for
Linux.  Before someone else starts to track down this bug I just
wanted to say that I have the fixes that are needed to make it work
(there are several problems).

I also have an emulation of the Linux mixer device to allow more
programs to work (this does not really affect raplayer).

I will submit a PR with this as soon as I figure out why I get a
little crackling noise sometimes when I start playing.

        -- Lennart