emulators/libc6-shim: Update 20260426 => 20260428
Changelog:
Map LINUX_CLOCK_BOOTTIME to CLOCK_MONOTONIC following FreeBSD 15 change.
Commit log:
https://github.com/shkhln/libc6-shim/compare/20260426...20260428
PR: 294834
Approved by: Alex S <iwtcex@gmail.com> (maintainer)
Sponsored by: UNIS Labs
MFH: 2026Q2
(cherry picked from commit ccfb0a1a43cc2ed5c71bb6a1c8c12ee433ccdfad)