Auto merge of #23957 - ferjm:readme.gst.msvc, r=jdm

Clarify instructions for installing GStreamer dependencies on Windows

- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes do not require tests

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@ -223,7 +223,7 @@ pip install virtualenv
``` ```
If this does not work, you may need to reboot for the changed PATH settings (by the python installer) to take effect. If this does not work, you may need to reboot for the changed PATH settings (by the python installer) to take effect.
3. Install the most recent [GStreamer](https://gstreamer.freedesktop.org/data/pkg/windows/) development package following [these instructions](https://github.com/sdroege/gstreamer-rs#gstreamer-binaries-1). You will also need to add `C:\gstreamer\1.0\x86_64\lib` to your `LIB` environment variable. 3. Install the most recent [GStreamer](https://gstreamer.freedesktop.org/data/pkg/windows/) MSVC development package following [these instructions](https://github.com/sdroege/gstreamer-rs#gstreamer-binaries-1). Note that the MinGW binaries will not work, so make sure that you install the MSVC the ones.
Note that you should ensure that _all_ components are installed from gstreamer, as we require many of the optional libraries that are not installed by default. Note that you should ensure that _all_ components are installed from gstreamer, as we require many of the optional libraries that are not installed by default.