Backport of "gl/wayland: Don't prefix wl_shell struct field" into 1.16
requested to merge tpm/gst-plugins-base:backport-mr-218-into-1.16-wip/nielsdg/fix-api-break into 1.16
Backport of !218 (merged) "gl/wayland: Don't prefix wl_shell struct field".
Commits:
- e8450397 gl/wayland: Don't prefix wl_shell struct field