oe.utils.both_contain() should return the result as "checkvalue" or "",
but the latest implement returns as "set(['checkvalue'])" or "";
It causes that bitbake.conf generates the wrong result of COMBINED_FEATURES,
which contains the common components in both DISTRO_FEATURE and MACHINE_FEATURES.
For example, build in Dizzy branch, COMBINED_FEATURES is "alsa usbhost ...",
but recently, COMBINED_FEATURES is like "set(['alsa']) set(['usbhost']) ...".
(From OE-Core rev: c4ca9dbd4191fcff08e75035e3d276490ed80b05)
Signed-off-by: Jun Zhu <R01007@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
dd90ccfa82