Upgrade to libvips v8.17.0

[kleisauke]

No description provided.

[lovell]

Thanks Kleis, I think I'm going to refactor out the version number checking logic from the build script (and merge the value of the libvips version into this) so it's quicker to check locally if there's a newer version of any dependency without running an entire build.

[kleisauke]

Great, sounds good to me.

I'm currently investigating this on the darwin-x64 runner:

Checking for function "rsvg_handle_set_stylesheet" with dependency librsvg-2.0: NO 

https://github.com/lovell/sharp-libvips/actions/runs/15489943190/job/43612935538#step:4:9155

Curiously, this is not an issue on the darwin-arm64v8 runner.
https://github.com/lovell/sharp-libvips/actions/runs/15489943190/job/43612935518#step:4:9010

(this was originally found in kleisauke/net-vips@2253e0a)

[lovell]

Perhaps prefix: '#include <librsvg/rsvg.h>' is required here?

https://github.com/libvips/libvips/blob/5da295f49fe27a33a79100cd332fe401d6835264/meson.build#L392

[kleisauke]

Good catch. I'll open a draft PR on this repository to see if it fixes the issue.

(sounds very similar to the issues linked to mesonbuild/meson#11011)

[lovell]

See commit be68966 for the CI improvements to version number checking (plus takes advantage of new ARM64 runners).