New comment by Goorzhel on void-packages repository

https://github.com/void-linux/void-packages/pull/34083#issuecomment-968461434

Comment:
```cpp
  #if !defined(TARGET_POSIX) || defined(TARGET_DARWIN) || defined(TARGET_FREEBSD) || defined(TARGET_ANDROID) || !defined(__GLIBC__)
        *pos = pFile->GetPosition();
  #else
        pos->__pos = pFile->GetPosition();
  #endif
```

So, the first branch seems to treat `pos` as an integer (I think), or at least something that can be assigned an integer, but that's not the case in musl:
```cpp
  typedef union _G_fpos64_t {
          char __opaque[16];
          long long __lldata;
          double __align;
  } fpos_t;
```
And the other branch also won't work because there's no `__pos` member.

I dunno, I think I'm going to need someone that groks C++ to take a look at this, because I'm in over my head here.