libxkbcommon: update to 1.1.0.

libxkbcommon 1.1.0 - 2021-02-27
==================

- Publish the `xkb-format-text-v1.md` file in the HTML documentation. This file
  existed for a long time but only in the Git repository.
  Link: https://xkbcommon.org/doc/current/md_doc_keymap_format_text_v1.html

- Add partial documentation for xkb_symbols to xkb-format-text-v1.md.

  Contributed by Simon Zeni.

- Update keysym definitions to latest xorgproto. In particular, this adds many
  special keysyms corresponding to Linux evdev keycodes.

  Contributed by Peter Hutterer <@who-t.net>.

- New API:
  Too many XKB_KEY_* definitions to list here.

(wiz)