Since this is a bootstrap recipe with PACKAGES = "", inherit the nopackages
class to skip the various packaging functions which wouldn't do anything anyway.
This fixes errors from buildhistory changes where packages-split would be empty.
(From OE-Core rev: 731c3d6f16fdf7f9eb862a477a5363c82cac237c)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>