x11/xkbcomp: Update to 1.5.0

Changelog: https://lists.x.org/archives/xorg-announce/2025-December/003645.html

PR: 291408
MFH: 2025Q4
Approved by: x11 (maintainer timeout)
Reported by: Polarian <polarian@polarian.dev>
Tested by: George Mitchell <george@m5p.com>

(cherry picked from commit 2008261f0e6ca54b9f030090c3506b6c5a8c16c3)