LibPthread: Disable debug spam by default

Libraries/LibPthread/pthread.cpp

@@ -37,7 +37,7 @@
 #include <time.h>
 #include <unistd.h>
 
-#define PTHREAD_DEBUG
+//#define PTHREAD_DEBUG
 
 namespace {
 using PthreadAttrImpl = Syscall::SC_create_thread_params;