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

retroarch: add support for Neon SIMD on armv7l
https://github.com/void-linux/void-packages/pull/27769

Description:
`retroarch` is useless without "core" modules that provide emulation capabilities. For Linux on ARM, libretro provides precompiled modules for `armhf` and `armv7-neon-hf`. The `armhf` modules generally work in our `armv7l` build, but the `armv7-neon-hf` modules may offer better performance and---at least in the case of the `picodrive` Sega module---better functionality (I couldn't get the `armhf` version to run without crashing on a Raspberry Pi 3B+).

Since not every ARMv7 implementation supports Neon, this is a build option. However, because I believe Neon is commonly supported, it is enabled by default.