Add a simple Weston driver.
Copy XDG_RUNTIME_DIR env into the driver environment on Linux platforms.
TEMPORARY: Use WestonDriver instead of Xvfb driver.
Updating the Jhbuild env: add automake, bump glib, gdk-pixbuf, gtk+, remove xserver.
WIP dump.
WIP dump #2.
Remove an unused symbol.
Remove unnecessary differences against upstream. These can be revised later.
WIP dump #3.
Moar dump.