gnulib: revert copyright date changes in imported files

Commit d01e823438 ("Update copyright dates to include 2025") changed the
dates in the gnulib imported source files, it probably shouldn't have.
Re-run update-gnulib.sh to restore those files.

gnulib/Makefile.in was also incorrectly modified, running the script
fixes that too.

Change-Id: I5d081f3438b9480130a92f59fd9fede33c121f9c
186 files changed