Because the license of cairo-trace is GPLv3(util/cairo-trace/COPYING).
So pickup cairo-trace,and modified the license to GPLv3.
(From OE-Core rev: 9e29a8bec3e6bcba38cf097181e50f1266b33221)
Signed-off-by: Lei Maohui <leimaohui@cn.fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>