There's a merged pull request on the void-packages repository

exiv2: update to 0.28.1.
https://github.com/void-linux/void-packages/pull/46838

Description:
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#### Testing the changes
- I tested the changes in this PR: **briefly**

TODO:
- [x] Fix `gwenview`'s failed checks (not really fixed but the exact same tests fail on master as well)
- [x] `test_exiv2` fails for `libextractor`
- [x] `kfilemetadata5` tests fail (same tests fail on master)
- [x] Fix `nufraw` cross-build
- [x] `digikam` fails to build

@Johnnynator ufraw has been [unmaintained since December 2016](https://sourceforge.net/p/ufraw/discussion/434060/thread/30b4249b/), and it doesn't build with this PR; here are the options:
- remove the package entirely
- replace it with the newer [nufraw](https://sourceforge.net/projects/nufraw/), which already has [an exiv 0.28.x patch floating around](https://aur.archlinux.org/cgit/aur.git/tree/exiv2-error.patch?h=nufraw)
- patch it to build with this PR

What do you think? (edit: `nufraw` now replaces `ufraw` in this PR)

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