fnott: add zlib license to list

fnott bundles nanosvg in-tree and builds with it, which is licensed
under the zlib license. The `license` meta-attr should reflect this (as
this more or less means nanosvg is part of the project), thus add the
zlib license to it.

See the pull-request discussion [0] and other precedents like [1].

[0] https://github.com/NixOS/nixpkgs/pull/225224
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982145#74

Signed-off-by: Christoph Heiss <christoph@c8h4.io>

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