Bump inputproto to 2.3.99.2

Merged Povilas Kanapickas requested to merge p12tic/xorgproto:inputproto-bump into master

Compared to 2.3.99.1 it includes a couple of fixes in specs which have been already merged.

Not related to any functionality, will merge without review.

Edited by Povilas Kanapickas

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