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

[RFC] Ayatana indicators
https://github.com/void-linux/void-packages/pull/35135

Description:
`libappindicator` hasn't seen a release since 2012 (almost 10 years!)
Debian has removed it in buster and switched to [libayatana-appindicator](https://ayatanaindicators.github.io/).
This PR is intended to prepare void linux for it. Let me know what you think...

I successfully built and tested all changed packages.

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#### New package
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