New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/34563#issuecomment-995389019

Comment:
Test failures on musl are because `SEEK_DATA` and `SEEK_HOLE` are defined in glibc headers, but not in musl ones. The values can be had from `<linux/fs.h>`, but that header brings in a lot of cruft too, idk if it's acceptable for upstream. If musl accepts the constants, we can just use that instead.