Log Message:
libxkbcommon: update to 1.2.0.

libxkbcommon 1.2.0 - 2021-04-03
==================

- `xkb_x11_keymap_new_from_device()` is much faster. It now performs only 2
  roundtrips to the X server, instead of dozens (in first-time calls).

  Contributed by Uli Schlachter.

- Case-sensitive `xkb_keysym_from_name()` is much faster.

- Keysym names of the form `0x12AB` and `U12AB` are parsed more strictly.
  Previously the hexadecimal part was parsed with `strtoul()`, now only up
  to 8 hexadecimal digits (0-9A-Fa-f) are allowed.

- Compose files now have a size limit (65535 internal nodes). Further sequences
  are discared and a warning is issued.

- Compose table loading (`xkb_compose_table_new_from_locale()` and similar) is
  much faster.

- Use `poll()` instead of `epoll()` for `xlbcli interactive-evdev`, making it
  portable to FreeBSD which provides evdev but not epoll. On FreeBSD, remember
  to install the `evdev-proto` package to get the evdev headers.

- The build now requires a C11 compiler (uses anonymous structs/unions).