Log Message:
wayland-protocols: Update to 1.18

This version comes with documentational clarifications, bug fixes and minor
additions to existing protocols. See the commit log for details.

Alexandros Frantzis (3):
      linux-explicit-synchronization: Allow fences with opaque EGL buffers
      linux-explicit-synchronization: Warn about using the protocol while using \ 
graphics APIs
      linux-explicit-synchronization: Clarify implicit synchronization \ 
guarantees of release events

Chia-I Wu (1):
      linux-dmabuf: clarify DRM_FORMAT_MOD_INVALID

Jan-Marek Glogowski (1):
      xdg-shell: use case to change the app ID at runtime

Jonas Ådahl (2):
      xdg-shell/README: Update E-mail address
      configure.ac: Bump version to 1.18

Sebastian Krzyszkowiak (1):
      xdg-shell: fix a typo

Simon Ser (3):
      xdg-output: deprecate the xdg_output.done event
      pointer-gestures: add a release request
      xdg-output: make xdg_output.description mutable