[PATCH weston] Update COPYING

[Jan Engelhardt]

On Wednesday 2017-02-15 16:02, Derek Foreman wrote:
>> diff --git a/COPYING b/COPYING
>> index faefd8f..418b4b4 100644
>> --- a/COPYING
>> +++ b/COPYING
>> @@ -1,8 +1,35 @@
>> +Copyright © 2008 Tungsten Graphics, Inc.
>> +Copyright © 2008-2013 Kristian Høgsberg

Since © already means Copyright, one of the two is redundant.