message: Remove <sys/prctl.h> and set thread name on BSD & __APPLE__
diff: #include <sys/sysctl.h> // sysctl
  #elif defined(__linux__)
  #include <malloc.h>
  -#include <sys/prctl.h>
  #endif
  namespace {
  @@ -266,8 +265,12 @@ bool TryMakeDirectory(const std::string& absolute_path) {
  void SetCurrentThreadName(const std::string& thread_name) {
  loguru::set_thread_name(thread_name.c_str());
  -#ifdef __linux__
  - prctl(PR_SET_NAME, thread_name.c_str(), 0, 0, 0);
  +#if defined(__APPLE__)
  + pthread_setname_np(thread_name.c_str());
  +#elif defined(__FreeBSD__) || defined(__OpenBSD__)
  + pthread_set_name_np(pthread_self(), thread_name.c_str());
  +#elif defined(__linux__)
  + pthread_setname_np(pthread_self(), thread_name.c_str());
  #endif
  }
  