community/vlc: add Pulse support

This makes it depend on runtime at so:libpulse.so.0. Do note that this
does not mean you install the entirety of PulseAudio if you install VLC,
it only installs the libpulse package which does nothing when you're not
running the rest of PulseAudio. VLC can still play through Alsa just
fine.

On my PulseAudio system this fixes an issue where playback is really
choppy and "[00005580c7431380] alsa audio output error: cannot estimate
delay: I/O error" is printed to the console
7 jobs for !10261 with vlc-pulse in 5 minutes and 8 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
failed #164659
docker-alpine x86_64 allowed to fail
lint

00:00:22

 
  Build
failed #164664
docker-alpine ci-build aarch64
build-aarch64

00:00:09

failed #164665
docker-alpine ci-build armv7
build-armv7

00:00:43

failed #164663
docker-alpine ci-build ppc64le
build-ppc64le

00:00:14

passed #164662
docker-alpine ci-build s390x
build-s390x

00:00:23

passed #164661
docker-alpine ci-build x86
build-x86

00:03:29

failed #164660
docker-alpine ci-build x86_64
build-x86_64

00:00:08

 
Name Stage Failure
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lint Lint
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build-x86_64 Build
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build-armv7 Build
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build-aarch64 Build
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build-ppc64le Build
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