Joel Brobecker 8ba85d8526 Import gnulib's latest update-copyright script...
... and update our copyright.py script to set environment variable
UPDATE_COPYRIGHT_USE_INTERVALS to '2' instead of '1'.  This tells
the script to collapse all years into one single interval.

gdb/ChangeLog:

        * gnulib/extra/update-copyright: Update to the latest from
        gnulib's git repository.
        * copyright.py: Set UPDATE_COPYRIGHT_USE_INTERVALS environment
        variable to 2 instead of 1.
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