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Add zlib_config target because perfetto depends on it.

Bug: 977964
Change-Id: I2aac5c3704f1274f932a61264d1c26a05f2db55e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2019035Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735201}