Drop unmaintined resvg-cli

[cmahnke]

Trying to install gtftools to Alpine 3.20 (on AArch64) fails due to an unmaintained package: rsvg-cli.
See anthrotype/resvg-wheels#5
It hasn't been updated for two years and is missing a downstream dependency update, which block compiling. Haven't looked what else might be missing.

There is another package providing resvg for python as well, see anthrotype/resvg-wheels#4

If both isn't possible we need to check if this can be made an optional dependency of gtftools.

[anthrotype]

could you temporarily try to see if it works if you tell pip to install resvg-cli from source? I think the incantation (when installing, say, nanoemoji) would be pip install --no-binary resvg-cli nanoemoji

[cmahnke]

No, it also doesn't work, same message. as in:
anthrotype/resvg-wheels#4

We should the discuss the cause there. for this issue it might be better to depend on another resvg module, this would also free you of the burden maintaining it.