Auto merge of #21437 - servo:jdm-patch-20, r=mbrubeck

Add gstreamer instructions for windows.

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@ -168,10 +168,12 @@ 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 Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default 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).
4. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default
settings for the installer are fine). settings for the installer are fine).
4. Install Visual Studio Community 2017 (https://www.visualstudio.com/vs/community/). You MUST add "Visual C++" to the 5. Install Visual Studio Community 2017 (https://www.visualstudio.com/vs/community/). You MUST add "Visual C++" to the
list of installed components. It is not on by default. Visual Studio 2017 MUST installed to the default location or mach.bat will not find it. list of installed components. It is not on by default. Visual Studio 2017 MUST installed to the default location or mach.bat will not find it.
> If you encountered errors with the environment above, do the following for a workaround: > If you encountered errors with the environment above, do the following for a workaround:
> 1. Download and install [Build Tools for Visual Studio 2017](https://www.visualstudio.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=15) > 1. Download and install [Build Tools for Visual Studio 2017](https://www.visualstudio.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=15)