Do not extract timestamps from zip archives.

They can be older than current out/ intermediates which makes ninja
miss updates when the update script is used locally.

Test: Run prebuilts/runtime/mainline/update.py and check timestamps
  on some prebuilt libraries
Merged-In: Ia5bbb0ea03c1f26ae7380983a736d90ec6272f90
Change-Id: Ia5bbb0ea03c1f26ae7380983a736d90ec6272f90
(cherry picked from commit 87e7bba3e31900d78aae3990f71bebb07e3d1b9d)