libcaca: Add zlib as a dependency.
libcaca: Add zlib as a dependency.

In order to load compressed figlet/toilet fonts, libcaca needs to have
support for zlib.

The motivation behind this is because I'm going to package toilet, which
comes with compressed fonts by default.

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

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