Wayland 1.5.0 support version 2 for wl_output proxy, which requires
wl_output_listener methods (geometry, mode, done and scale )

whereas wayland 1.0.3 support version 1 for wl_output proxy, which
requires wl_output_listener methods (geometry, mode).

Wayland client was developed on wayland 1.0.3 hence wl_output_listener
had only 2 methods (geometry, mode) and (done, scale) were NULL, causing
segmentation fault when wayland server tried to call those callbacks.

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https://bugs.launchpad.net/bugs/1098064

Title:
  weston-desktop-shell crashed with SIGSEGV in ffi_call_unix64()

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