Update gifski library

[sindresorhus]

@kornelski Would you be able to update https://github.com/ImageOptim/gifski/tree/master/gifski.xcodeproj to latest Xcode and then update the gifski library in this repo? I noticed it has had a bunch of improvements since the last time we updated: ImageOptim/gifski@94d6339...master

[sindresorhus]

I'm also seeing a bunch of warnings when compiling now:

:-1: object file (/Users/sindresorhus/Library/Developer/Xcode/DerivedData/Gifski-czyyuqkvdbamwdbhqpunkswgmddo/Build/Products/Debug/libgifski.a(state.o)) was built for newer OSX version (10.14) than being linked (10.13)

I assume we need to set the target macOS version somewhere, but not sure where.

[kornelski]

The target version is set via MACOSX_DEPLOYMENT_TARGET env var. I'm surprised that you see this, because Xcode generally sets it itself. Check the build log in Xcode — maybe some Xcode target has wrong deployment target set.

[kornelski]

The changes so far were cosmetic, so no rush. As I've mentioned in another thread, I want to make the C API more C-ish, so I'll have a bigger update "soon"

[sindresorhus]

The target version is set via MACOSX_DEPLOYMENT_TARGET env var. I'm surprised that you see this, because Xcode generally sets it itself. Check the build log in Xcode — maybe some Xcode target has wrong deployment target set.

It did indeed have the wrong deploy target, but even after fixing that (03543bd), I still see the warnings.