[rfc] server: Use rtkit to set realtime priority, try 3

[Maarten Lankhorst]

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Hi gus,

Thought I'd try again :) This is a cleaned up version. The license on
rtkit.c will still have to change, but since it's so heavily modified
to get it into a shape for wine, that only a few lines in
make_realtime are still original, so it would be easy to rewrite the
remainder of that function to get it fully lgplv2.1.

See also https://tango.0pointer.de/pipermail/pulseaudio-discuss/2010-May/007058.html

Are there any issues left, or shall I submit this one to wine-patches
after the patch linked above is merged into rtkit.git ?

Cheers,
Maarten