archiver.bbclass: adapt do_unpack_and_patch to RSS
do_unpack_and_patch was not correctly run until recently
("archiver.bbclass: various fixes for original+diff mode") but
with the fix applied, the errors we get indicate the function
is not adapted to work with recipe specific sysroots.
do_unpack_and_patch sets WORKDIR to ARCHIVER_WORKDIR which
affects all path settings relative to WORKDIR, inluding the paths
to recipes' sysroots. IOW, when do_unpack and do_patch are run, they
cannot find the necessary native tools and files located in the
sysroot (e.g., quiltrc) because the paths point to ARCHIVER_WORKDIR.
Adapt do_unpack_and_patch to RSS by restoring the original
STAGING_DIR_NATIVE after WORKDIR is changed to ARCHIVER_WORKDIR.
Signed-off-by: Mikko Ylinen <mikko.ylinen@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
