New review comment by jkoderu-git on void-packages repository

https://github.com/void-linux/void-packages/pull/23390#discussion_r637059865

Comment:
> I changed the case in my repo to try a fix for musl
> 
> ```
> if [ "$XBPS_TARGET_LIBC" = musl ]; then
> 	makedepends+=" libexecinfo-devel"
> fi
> ```
> 
> but I can't test because of a CI error.
> 
> ```
> Run common/travis/changed_templates.sh
> Changed packages:
> fatal: bad revision ''
> ```

It does not work. I add the `FIXME` then.