[gstreamer, gst-rtsp-server] update and add port

[mathisloge]

Describe the pull request

Updates gstreamer to latest 1.19.2 and adds gst-rtsp-server

• Which triplets are supported/not supported? Have you updated the CI baseline?

no

• Does your PR follow the maintainer guide?

yes

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

yes

If you are still working on the PR, open it as a Draft: https://github.blog/2019-02-14-introducing-draft-pull-requests/

[ras0219-msft]

LGTM, thanks for the update and new port!

[luncliff]

Can we run the build for this PR again?
I want to check the build log for x64-osx.
This port should fail because it requires Gstreamer's bad plugin which is not supported yet(#17394).

[dg0yt]

Can we run the build for this PR again?

git commit --allow-empty -m "[skip actions] CI"
git push

[dg0yt]

(Or merge master, and push.)

[mathisloge]

(Or merge master, and push.)

I've done this. But didnt work for merged PRs

[dg0yt]

But didnt work for merged PRs

Sorry, I didn't pay attention...

This port should fail because it requires Gstreamer's bad plugin

vcpkg daily CI builds gstreamer[core,plugins-good,plugins-ugly]:x64-osx. Where does it require the bad plugin?
https://dev.azure.com/vcpkg/public/_build/results?buildId=66830&view=logs&j=7b75bd19-17d3-53d4-00fd-23f1a49a8ba4&t=a23dba4e-3a62-59dc-a73c-a7222676d7a4

[luncliff]

#22910 gst-rtsp-server was trying to find the bad plugin with pkg-config. It's not installed by port gstreamer. Eventually, gst-rtsp-server's configuration should fail.