We should not redirect stderr to stdout if we need to get separated
stdout and stderr contents from Popen.communicate() later.
(Bitbake rev: 1ecc1d9424877df89fcda2f23c306998998a65ff)
Signed-off-by: Anton Mikanovich <amikan@ilbers.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>