The current kernel supports WERROR now, and there is no Werror in
tools/perf/Makefile, remove both sed commands.
(From OE-Core rev: 664508e6307903fdc3054ca84d37f16718c41ede)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>