busybox: generalize recipe to work with arbitrary install directories
Allow configuring base_bindir, base_sbindir, bindir and sbindir
arbitrarily.
Also change the temporary symlinks created in the postinst script from
relative to absolute to make the code simpler and more flexible. There was
no reason to use relative links anyways, as directly afterwards
update-alternatives would replace them by absolute links anyways.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: Ross Burton <ross.burton@intel.com>
