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surface: add WLR_SURFACE_STATE_SUBSURFACES

Simon Ser requested to merge emersion/wlroots:subsurfaces-state-flag-v2 into master

This allows to figure out when the subsurface list has changed: subsurface added, removed, or re-ordered. In the case where the subsurface list hasn't changed, some book-keeping operations can be skipped.

Re-spin of the first commit of !3170 (closed)

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