Use dbus-run-session in CI builds

dbus-launch requires the X11 server running but we are in fact
running it after, so use dbus-run-session instead.

Author: plfiorini

.travis.yml

@@ -36,7 +36,7 @@ arch:
     - qbs-setup-toolchains --detect
     - qbs-setup-qt /usr/bin/qmake-qt5 qt5
     - qbs config profiles.qt5.baseProfile ${CC}
-    - eval `dbus-launch --sh-syntax` && xvfb-run -a -s "-screen 0 800x600x24" qbs build -d build -j $(nproc) profile:qt5
+    - dbus-run-session -- xvfb-run -a -s "-screen 0 800x600x24" qbs build -d build -j $(nproc) profile:qt5
 
 script:
   - "curl -s https://raw.githubusercontent.com/lirios/repotools/develop/travis/docker-travis.sh | bash"