Fixed concurrency problem for ZIP packed recipes.

Fixed concurrency problem for ZIP packed recipes.

The problem occured when unzip-native is not yet staged, and ZIP
archive unpacking already started resulting in failed do_unpack task.

(oe.dev has a NEED_UNZIP_FOR_UNPACK variable we did not bring over)

[RP: Use srcuri from already existing variable]
Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>
Signed-off-by: Koen Kooi <koen@openembedded.org>
Signed-off-by: Tom Rini <tom_rini@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>