unittest: add missing dep on zlib config since test includes <zlib.h>
unittest: add missing dep on zlib config since test includes <zlib.h>

This works by accident since most platforms already have zlib.h
somewhere on the system path.

Change-Id: I37d1c7296c9781c0fd77523a704f48e593ae24a6

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto