community/sdl2: Enable jack audio output.

* Some cosmetic changes.
7 jobs for !13280 with sdl in 57 seconds (queued for 1 second)
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Status Job ID Name Coverage
  Lint
passed #222157
docker-alpine x86_64
lint

00:00:24

 
  Build
failed #222162
docker-alpine ci-build aarch64
build-aarch64

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failed #222163
docker-alpine ci-build armv7
build-armv7

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docker-alpine ci-build ppc64le
build-ppc64le

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failed #222160
docker-alpine ci-build s390x
build-s390x

00:00:07

failed #222159
docker-alpine ci-build x86
build-x86

00:00:07

failed #222158
docker-alpine ci-build x86_64
build-x86_64

00:00:07

 
Name Stage Failure
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build-armv7 Build
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build-s390x Build
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build-x86 Build
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build-ppc64le Build
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