New review comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/27510#discussion_r552537780

Comment:
My 2 cents:
I would use:
```c
#if (defined(__linux__) && !defined(__GLIBC__)) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__APPLE__)defined(__APPLE__)
```

With this form, we can submit to upstream.