[pulseaudio] Enable support for libsoxr

[Andrey Semashev]

Hi,

I'd like to ask to enable support for libsoxr-based resamplers in the official Ubuntu 
packages for pulseaudio. The upstream already supports libsoxr and 
automatically detects its availability, so the only change really needed is to add 
the build dependency to debian/control.

The resamplers based in libsoxr offer better quality and better performace while 
introducing more delay compared to the speex resamplers that are used by 
default. The resamplers are documented in the man pages of pulseaudio in 
Ubuntu 16.04 but unfortunately are not enabled at build time ('pulseaudio --dump-
resample-methods' doesn't list them). I've built local packages with libsoxr and 
verified that the resampler works as expected.

I'm new to this list, so I'm not sure how to proceed from here. Should I create a 
bug report asking for this feature?

Thanks.

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