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

https://github.com/subnut/void-packages mozjs91-91.5.0
https://github.com/void-linux/void-packages/pull/36241

[DRAFT] New package: mozjs91-91.5.0
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#### Current state -
- To fix `i686`, we need to upgrade `rustc` to a newer version  
  (according to a user in `##rust` in `libera.chat`)
- To fix cross compilation, **I AM CLUELESS.**  
  I tried literally everything I could for 4 continuous hours.
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A patch file from https://github.com/void-linux/void-packages/pull/36241.patch is attached