Auto merge of #21427 - paulrouget:gstreamer-instructions-update, r=jdm

More gstreamer dependencies

Was running into this issue:

```
error: failed to run custom build command for `gstreamer-player-sys v0.5.0`
process didn't exit successfully: `/home/paul/git/servo/target/debug/build/gstreamer-player-sys-3591c80c70153c3c/build-script-build` (exit code: 1)
--- stderr
`"pkg-config" "--libs" "--cflags" "gstreamer-player-1.0 >= 1.12"` did not exit successfully: exit code: 1
--- stderr
Package gstreamer-player-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gstreamer-player-1.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gstreamer-player-1.0' found
```

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bors-servo 2018-08-16 11:14:43 -04:00 committed by GitHub
commit 5da5ede9c7
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@ -84,7 +84,7 @@ sudo apt install git curl autoconf libx11-dev \
libssl1.0-dev libbz2-dev libosmesa6-dev libxmu6 libxmu-dev \
libglu1-mesa-dev libgles2-mesa-dev libegl1-mesa-dev libdbus-1-dev \
libharfbuzz-dev ccache clang \
libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-bad1.0-dev
```
If you using a version prior to **Ubuntu 17.04** or **Debian Sid**, replace `libssl1.0-dev` with `libssl-dev`.