cleanup leftovers on pkg removal

clean up tmp files when pkg is going to be removed.

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>
update build options

--without-tests is no obsolete and is no longer enabled by default. Instead
we use --with-tests now if we want them.

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>