Whilst debugging an autobuilder failure, I wondered why it was rebuilding qemu-system-native
instead of reusing from sstate. The reason was it was overwriting DISTRO_FEATURES,
in this case removing opengl which caused much to rebuild.
The test doesn't need that so don't do it.
(From OE-Core rev: fdcc011608fd9558a081d0ace3eaf7192d9fcaef)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>