* add utf8cpp git submodule
More standard. Allows using the system provided utf8cpp.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
* cmake: use standard find_package for zlib
Simpler.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
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Signed-off-by: Rosen Penev <rosenp@gmail.com>