Auto merge of #27386 - asajeffrey:readme-gstreamer-packages, r=Manishearth

Added debian gstreamer packages to README

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Document which gstreamer packages are needed on Ubuntu 20.04LTS.

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #27363
- [x] These changes do not require tests because it's edits to the README

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bors-servo 2020-07-24 13:57:25 -04:00 committed by GitHub
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@ -84,7 +84,10 @@ sudo apt install git curl autoconf libx11-dev libfreetype6-dev libgl1-mesa-dri \
libgstreamer-plugins-bad1.0-dev autoconf2.13 llvm-dev
```
Additionally, you'll need a local copy of GStreamer with a version later than 12.0. You can place it in `support/linux/gstreamer/gst`, or run `./mach bootstrap-gstreamer` to set it up.
Additionally, you'll need a local copy of GStreamer with a version later than 16.2. You can place it in `support/linux/gstreamer/gst`, or run `./mach bootstrap-gstreamer` to set it up. On **Ubuntu 20.04LTS**, you can use the system GStreamer if you install the necessary packages:
``` sh
sudo apt install gstreamer1.0-nice gstreamer1.0-plugins-bad
```
If you are using **Ubuntu 16.04** or **Linux Mint 18.&#42;** run `export HARFBUZZ_SYS_NO_PKG_CONFIG=1` before building to avoid an error with harfbuzz.