This makes sure the the first build starts from a clean state. Otherwise
one could have the first build affected by any leftover state from
a previous build.
This also leaves a working state behind after the final build.
(From OE-Core rev: f8f86ac88aa1bba99ba28762cfbd97d3721da7d9)
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>