Support image crate 0.25 and not 0.24

[j-baker]

No description provided.

[honzasp]

Thanks for the PR! The 0.24 version of image still has more downloads on crates.io than 0.25, so I would like to keep support for 0.24. Fortunately, these two versions seem to be quite similar, so we can support both 0.24 and 0.25 without any change in code.

I released these changes as turbojpeg 1.1.1.