bootstrap: add mising libx11-xcb-dev
To make gst-plugins-base build happen as GL is forced to build in the recipe, need to install this on ubuntu 18.04 to make it work.
Fix #270 (closed)
To make gst-plugins-base build happen as GL is forced to build in the recipe, need to install this on ubuntu 18.04 to make it work.
Fix #270 (closed)