copyright: Remove duplicate copyright notices

These were split out in commit 8dba02e7f54dc49296e676c7e9b4a8ba48697db2.

Found using the following commands:

    files="$(sed -n '4,91{ s/,//g; p; }' ../../copyright)"; sed -n '94,184{ s/Copyright *//; s/([Cc]) *//; s/^[0-9][0-9][0-9, -]*//; s/^by *//; p; }' ../../copyright | while read -r line; do grep -Fq "${line}" ${files} || printf '%s\n' "${line}"; done
    files="$(sed -n '1940,1987{ s/,//g; p; }' ../../copyright)"; sed -n '1990,2026{ s/Copyright *//; s/([Cc]) *//; s/^[0-9][0-9][0-9, -]*//; s/^by *//; p; }' ../../copyright | while read -r line; do grep -Fq "${line}" ${files} || printf '%s\n' "${line}"; done

Or, more readably:

    files="$(sed -n '4,91{ s/,//g; p; }' ../../copyright)"
    sed -n '94,184{
        s/Copyright *//; s/([Cc]) *//;
        s/^[0-9][0-9][0-9, -]*//; s/^by *//; p;
    }' ../../copyright | while read -r line; do
        grep -Fq "${line}" ${files} || printf '%s\n' "${line}"
    done
    files="$(sed -n '1940,1987{ s/,//g; p; }' ../../copyright)"
    sed -n '1990,2026{
        s/Copyright *//; s/([Cc]) *//;
        s/^[0-9][0-9][0-9, -]*//; s/^by *//; p;
    }' ../../copyright | while read -r line; do
        grep -Fq "${line}" ${files} || printf '%s\n' "${line}"
    done

0 files changed, 0 insertions, 0 deletions