archiver.bbclass: Run deploy_archives in $WORKDIR

In recipes that are exempt from source code archiving due to
COPYLEFT_LICENSE_EXCLUDE, do_deploy_archives does not have a transitive
dependency on do_unpack. Given enough parallelism, this means
do_deploy_archives can run at the same time or before do_unpack.

Because do_deploy_archives did not specify a working directory, its
working directory was ${B}, which defaults to ${S}, which may be set by
a recipe to a directory that is created by do_unpack.

In this case, do_deploy_archives can fail because do_unpack deletes and
re-creates the directory and do_deploy_archives cannot change into the
non-existent directory. Avoid this problem by explicitly specifying
a working directory for do_deploy_archives (and for
do_deploy_all_archives as well for good measure).

Signed-off-by: Clemens Lang <clemens.lang@bmw-carit.de>
Signed-off-by: Ross Burton <ross.burton@intel.com>

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