Possible licence mismatch with @wasm-codecs/gifsicle due to GPL code running in the same process

[lovell]

Hi Cyril, I was researching some of your very useful image-optimisation related repos and discovered a possible licensing problem. I'm sorry to be the bearer of bad news, but it looks like the @wasm-codecs/gifsicle package published to npm contains a compiled, binary form of the GPL gifsicle.

Whilst the code in this repo can remain MIT-licensed, the combined work should be considered GPL-2.0 as it runs in the same process. With the usual "I am not a lawyer" proviso, I think this means the license field should be set to GPL-2.0 as this is what is published to npm.

Any packages depending upon @wasm-codecs/gifsicle that run in the same Node.js process are likely to be equally affected.