New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/32069#issuecomment-883458069

Comment:
```
[353/592] Compiling C object src/modules/libpipewire-module-rtkit.so.p/module-rtkit.c.o
../src/modules/module-rtkit.c: In function '_gettid':
../src/modules/module-rtkit.c:186:17: warning: implicit declaration of function 'gettid'; did you mean '_gettid'? [-Wimplicit-function-declaration]
  186 |  return (pid_t) gettid();
      |                 ^~~~~~
      |                 _gettid
```