Clean up nested ifdefs

kitty/threading.h

@@ -8,29 +8,26 @@
 
 #include <stdio.h>
 #include <pthread.h>
-#ifdef __APPLE__
+#if defined(__APPLE__)
 // I cant figure out how to get pthread.h to include this definition on macOS. MACOSX_DEPLOYMENT_TARGET does not work.
 extern int pthread_setname_np(const char *name);
-#else
-#ifdef __FreeBSD__
+#elif defined(__FreeBSD__)
+// Function has a different name on FreeBSD
 void pthread_set_name_np(pthread_t tid, const char *name);
 #else 
 // Need _GNU_SOURCE for pthread_setname_np on linux and that causes other issues on systems with old glibc
 extern int pthread_setname_np(pthread_t, const char *name);
 #endif
-#endif
 
 static inline void
 set_thread_name(const char *name) {
     int ret = 0;
-#ifdef __APPLE__
+#if defined(__APPLE__)
     ret = pthreadset_name_np(name);
-#else
-#ifdef __FreeBSD__
+#elif defined(__FreeBSD__)
     pthread_set_name_np(pthread_self(), name);
 #else
     ret = pthread_setname_np(pthread_self(), name);
-#endif
 #endif
     if (ret != 0) perror("Failed to set thread name");
 }