[PATCH xserver] test: Use $XSERVER_BUILDDIR for Xvfb executable path

[Adam Jackson]

On Wed, 2016-10-05 at 10:34 -0700, Eric Anholt wrote:

> Reviewed-by: Eric Anholt <eric at anholt.net>

Merged:

remote: I: patch #113692 updated using rev 95d3980c7c991b2cc8dcadac173635641ae15865.
remote: I: 1 patch(es) updated to state Accepted.
To ssh://git.freedesktop.org/git/xorg/xserver
   cc69d4f..95d3980  master -> master

- ajax