devtool: runqemu: work around runqemu script path assumption
The new runqemu script assumes that if OECORE_NATIVE_SYSROOT is set then
it shouldn't try to run bitbake to find out the values of various
variables such as DEPLOY_DIR_IMAGE; this assumption is incorrect for the
extensible SDK. To work around this, clear OECORE_NATIVE_SYSROOT in the
environment when running runqemu.
Fixes [YOCTO #10447].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
