src_distribute.bbclass: iterate over SRC_URI instead of using urldata
src_distribute.bbclass: iterate over SRC_URI instead of using urldata

Do not use bb.fetch.urldata in do_distribute_sources() for traversing
SRC_URIs like was already done for do_unpack(). See 661658f62b for
additional info.

This fixes race issue with lzma-native:
http://lists.linuxtogo.org/pipermail/openembedded-devel/2010-October/026076.html

Signed-off-by: Yuri Bushmelev <bf8ae8ef3970bd3a1b9d3016d538326a75c528ec@gmail.com>
Acked-by: Chris Larson <4c8c411260e601995081b113a5ef94a26eff2b25@mentor.com>
Acked-by: Andrea Adami <58a22b0beb8ec13ae546a060c8b4c576f22f6153@gmail.com>

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