wayland-protocols: upgrade 1.34 -> 1.35

wayland-protocols: upgrade 1.34 -> 1.35

Changelog:
==========
- tablet-v2: mark as stable
- staging: add alpha-modifier protocol
- xdg-shell: add missing enum attribute to set_constraint_adjustment
- xdg-shell: recommend against drawing decorations when tiled
- cursor-shape-v1: Does not advertises the list of supported cursors

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>