New review comment by xaizek on void-packages repository

https://github.com/void-linux/void-packages/pull/44870#discussion_r1272526180

Comment:
A fix could look like adding this at the top of `src/sort.c` (before or after includes, doesn't really matter):
```c
#ifdef HAVE_STRVERSCMP_FUNC
#    undef HAVE_STRVERSCMP_FUNC
#endif
```
(`#undef` alone might also work, but just in case.)
This will always use custom implementation of `strverscmp()` (Windows doesn't have it and BSD-systems probably too).  The tests validate custom implementation and that behaviour is consistent across various systems.