There is an updated pull request by lun-4 against master on the void-packages repository

https://github.com/lun-4/void-packages libsndfile-update-links
https://github.com/void-linux/void-packages/pull/26023

libsndfile: use python3 when building
 - Use `python3` as it's compatible (see libsndfile/libsndfile#490)
 - Noticed the repository moved to its own organization. Update homepage and distfiles to keep it in sync.
   - The old `distfiles` url still redirects and the given `.tar.bz2` file from it has matching hashes, so `checksum` didn't update.

A patch file from https://github.com/void-linux/void-packages/pull/26023.patch is attached