There is an updated pull request by tm512 against master on the void-packages repository

https://github.com/tm512/void-packages fceux
https://github.com/void-linux/void-packages/pull/39396

fceux: upgrade to version 2.6.4
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#### Testing the changes
- I tested the changes in this PR: **YES**

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#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)

A patch file from https://github.com/void-linux/void-packages/pull/39396.patch is attached