ibus: 1.5.16 -> 1.5.17, fix, back to single output

This fixes ibus-setup.

* Update cldrEmojiAnnotation: 31.0.1_1 -> 31.90.0_1
* Move ibus-setup back to out, and use a smaller Python 3 at runtime
  than doesn't pull in some dev paths
* Build from Git
* Use autoreconfHook so that we don't have to patch ./configure scripts
  when we could just generate them correctly in the first place
* Drop patch that removes IBUS_* environment variables from ibus-setup
  wrapper: unsetting them breaks ibus-setup
* Add withWayland option (building with Wayland requires libxcbcommon
  package, previously wayland was included into buildInputs w/o
  libxcbcommon and respective configure flag)
* Add license (LGPLv2.1)

Relies on two other commits in this branch that add GI_TYPELIB_PATH
discovery and fix gconf Python scripts.