gnu: pulseaudio: increase timeout of thread test. * gnu/packages/patches/pulseaudio-test-timeouts.patch: New file. * gnu/packages/pulseaudio.scm (pulseaudio): Add patch. * gnu-system.am (dist_patch_DATA): Add patch.
gnu: Add pavucontrol. * gnu/packages/pulseaudio.scm (pavucontrol): New variable.
gnu: pulseaudio: Add dependency on libcap. * gnu/packages/pulseaudio.scm (pulseaudio): Add dependency on libcap.
gnu: Add PulseAudio and related libraries. * gnu/packages/pulseaudio.scm: New file. * gnu-system.am (GNU_SYSTEM_MODULES): Add it.