The script oe-buildenv-internal is called from oe-init-build-env.
Make sure oe-init-buildenv does not return an error if BB_ENV_EXTRAWHITE is
already set, otherwise this will cause oe-init-build-env to fail.
(From OE-Core rev: 9ae79973cfdabd1b4dacddce32735c65fe3544e4)
Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>