New comment by leahneukirchen on void-packages repository

https://github.com/void-linux/void-packages/pull/14758#issuecomment-536473054

Comment:
This fixes build on musl (no idea what I was thinking above):

```
case "$XBPS_TARGET_MACHINE" in
        *-musl) makedepends+=" musl-fts-devel"
esac
```