upgrade to newer libvips version

[HolyOne]

Hello, I tried to save as GIF but could not achieve it because this library was looking for libvips 4.2

I see that newer version of libvips can save in gif format but it seems in .net library i am limited to an older version.

[HolyOne]

By the way I use NetVips.Native package for adding binaries to my project. but as I see I have no other option since the project supports 4.2 version

[kleisauke]

What did you mean with 4.2? I think you meant 42 which is libtool ABI number visible in the filename of the libvips binaries. This version does not not correspond to the major / minor / patch version but means that the ABI is stabilized since libvips 8.0.

See #108 for the reason why ImageMagick is not included in the prebuilt libvips binaries released on NuGet.

[kleisauke]

Hope this helped, please re-open if questions remain.