Hi,

This modernizes the package declaration for libxkbcommon by using
G-expressions. Also, input folders are found via their expected
relative paths (i.e. the modern way) instead of the input label. The
latter was an issue when the official xkeyboard-config was replaced
with a customized package holding additional keyboard layouts.

Ultimately reaches 3435 packages and thus belongs into core-updates.

Kind regards
Felix Lechner