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

https://github.com/pullmoll/void-packages osrel
https://github.com/void-linux/void-packages/pull/12160

runit-void: update os-release information
The file /etc/os-release is used by e.g. os-prober (for grub) to extract
information for both, grub labels and user information.
For multiple boot partitions like glibc vs. musl libc, big vs. little
endian the user could not tell which partition contained which variant
because their names was always just "void".

This update creates an individual /etc/os-release containing information
about the libc (glibc or musl), the CPU architecture and endianness, and
the floating point options, if they are relevant.

The variable DISTRIB_ID is not defined in the description at:
https://www.freedesktop.org/software/systemd/man/os-release.html

A patch file from https://github.com/void-linux/void-packages/pull/12160.patch is attached