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

vivaldi: update to 6.0.2979.18, unrestrict, support user flags, adopt.
https://github.com/void-linux/void-packages/pull/43728

Description:
will now read the contents of `$XDG_CONFIG_HOME/vivaldi-stable.conf` and pass that to the underlying binary

patch comes from arch

for example, to force `prefers-color-scheme: dark` and work on wayland:
```
$ cat ~/.config/vivaldi-stable.conf
--force-dark-mode --ozone-platform-hint=auto
```

missing dependencies libnotify and xdg-utils also added

permission to redistribute has now been granted, see `srcpkgs/vivaldi/files/redistribution-permission.eml`

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