Auto merge of #22166 - topecongiro:arch-linux-dependencies, r=ferjm

Add gstreamer and gstreamer-vaapi to Arch Linux dependencies

Running `./mach build --dev` on Arch Linux fails with error messages about missing gstreamer.

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bors-servo 2018-11-12 00:36:33 -05:00 committed by GitHub
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@ -183,7 +183,7 @@ sudo zypper install libX11-devel libexpat-devel libbz2-devel Mesa-libEGL-devel M
``` sh
sudo pacman -S --needed base-devel git python2 python2-virtualenv python2-pip mesa cmake bzip2 libxmu glu \
pkg-config ttf-fira-sans harfbuzz ccache clang autoconf2.13
pkg-config ttf-fira-sans harfbuzz ccache clang autoconf2.13 gstreamer gstreamer-vaapi
```
#### On Gentoo Linux