Log Message:
xorgproto: update to 2021.4.

The big new feature in this release is Olivier's addition that makes up
XFixes 6: the new ClientDisconnectMode. An X server that is started on
demand (Xwayland) should ideally also terminate when the last client
disconnects. However, some X11 clients that provide system services will
linger around forever, preventing that shutdown.

With the new XFixes request, a client can designate itself as
to-be-terminated and the X server can ignore those clients when counting the
number of remaining clients. If no other clients are left, the server can
shut down.

Note that this requires changes to the X server and each client to work.

Hannah Rittich (1):
      Corrected comments in keysymdef.h.

Olivier Fourdan (1):
      xfixes: Add ClientDisconnectMode

Peter Hutterer (9):
      Makefile.am: reorder the protocols to group by default and LEGACY
      Makefile.am: move the man page rules to the top
      Integrate the keysym verifier into make check
      meson.build: use built-in variable substitution handling instead of sed
      meson.build: install the protocol .txt files in doc
      gitlab CI: add a job to compare meson and autotools standard installs
      scripts: exit with 77 if python-libevdev is missing
      gitlab CI: check that the autotools and meson versions are in sync
      xorgproto 2021.4

Pierre Le Marre (1):
      Deprecate XK_approxeq and XK_notapproxeq.