x11-wm/picom: Update 12.1 → 12.2
Changelog:
https://github.com/yshui/picom/releases/tag/v12.2
Upstream fixed build and work on 32-bit systems - remove local patches.
PR: 282014
MFH: 2024Q4
(cherry picked from commit 11c31a3bd07d6d3a887b0c2cc04aae04f9dee9c9)