wlroots 0.8.1

This update fixes Drew's continued ability to find novel ways to mess up
releases.

Filip Sandborg (1):
      render/gles2: fix calculation for partial gles2 pixel read (#1809)

Ilia Bozhinov (1):
      layer-shell: ignore ack_configure() on closed surfaces

Ivan Molodetskikh (2):
      presentation_feedback: add the sampled state
      drm: use IMPORT_FD for INVALID modifier

Markus Ongyerth (3):
      Move initialization of wlr_tablet_pad into types/wlr_tablet_pad
      Add zwp-tablet-unstable-v2 client support
      Clean up wayland backend tablet support

Rouven Czerwinski (1):
      backend/drm: check for mst: in path property

Scott Anderson (1):
      render/egl: Change KHR_debug log to include error code

Sebastian Krzyszkowiak (1):
      wlr_seat_touch: Destroy the touchpoint on client destroy

Simon Ser (1):
      compositor: disconnect client on OOM in create_surface

Versus Void (1):
      xdg-output: send wl_output.done after xdg_output created

amingin (1):
      Fixes crash of compositor when unvalidated keycode 0 is passed (#1833)