Users are surprised when dirs/cleandirs aren't acted upon for
empty functions. This reorders the code slightly so that those
flags are acted upon for empty functions as there are cases where
this is expected.
[YOCTO #10256]
(Bitbake rev: 5bf874673d75b5f4ff2b34f0ab8502558ee84d00)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>