Packaging: re-enable XDG_Shell for Tizen
The Weston has been upgraded to 1.5 and XDG_Shell basics for Weston 1.5 have been in oz-wl.
So we think it's time to re-enable it now. Meanwhile some related issues are under fixing. More changes will come in.
Merge pull request #2330 from yejingfu/oz-wl

[Tizen] Packaging: re-enable XDG_Shell for Tizen