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The previous code used unzip to get the offsets of the files in
the zip file. This was an estimate, and it turns out to be wrong
in many cases. Replace that with zipinfo -v which gives the exact
offset of the files in the zip.

Also update the tmp files so that they are in a dictionary of their
own by apk, instead of embedded in the offset list.

Change-Id: I8f5efd95f2d2e39e20cc0b6b6571b799be21ef32