New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/33753#issuecomment-955570454

Comment:
```
zfuncs.cc:1435:31: error: 'PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP' was not declared in this scope; did you mean 'PTHREAD_MUTEX_INITIALIZER'?
 1435 | pthread_mutex_t   spinmutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;            //  21.44
      |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                               PTHREAD_MUTEX_INITIALIZER
```

They've started using glibc-only functionality. Would you mind opening an issue upstream to ask for a fix there? Otherwise this is kinda hard to solve cleanly (though I can come up with a patch if necessary).