Eugene Syromyatnikov 295cf322b1 update_copyright_years.sh: workaround for old git versions
Old git versions (like the one shipped in Debian 8) do not support setting
date format with --date, working this around by processing git log output
with date +%Y.

* main/update_copyright_years.sh (process_file) <first_commit_year,
last_commit_year>: Change format to format:%aD, remove --date, supply
output as a -d option argument to date +%Y.
2017-08-27 11:06:14 +00:00
..
2017-05-22 17:33:51 +00:00
2017-05-22 17:33:51 +00:00
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