We need to run sed with the -u option to ensure the output is unbuffered else
ptest-runner may timeout thinkig things were idle. Busybox doesn't have the -u
option so we need to RDEPEND on sed (which is a good thing to do if we use it
anyway).
Alex Kanavin should get credit for discovering the problem.
(From OE-Core rev: d3ffbebf43c23faa43af81c9ecf6fcaef36d675b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
57933bd958