support c++ tools on macos (#2063)

Running reference tests/decompiler should now be possible on macos
(arm). Most of the changes were just cleaning up places where we were
sloppy with ifdefs, but there were two interesting ones:
- `Printer.cpp` was updated to not use a recursive function for printing
lists, to avoid stack overflow
- I replaced xxhash with another version of the same library that
supports arm (the one that comes in zstd). The interface is C instead of
C++ but it's not bad to use. I confirmed that the extractor succeeds on
jak 1 iso so it looks like this gives us the same results as the old
library.

game/system/SystemThread.cpp

@@ -1,9 +1,10 @@
 #include "SystemThread.h"
 
+#include "common/common_types.h"
 #include "common/log/log.h"
 #include "common/util/unicode_util.h"
 
-#ifdef __linux
+#ifdef OS_POSIX
 #include <pthread.h>
 #else
 // Include order matters...
@@ -96,8 +97,10 @@ void* bootstrap_thread_func(void* x) {
   SystemThread* thd = (SystemThread*)x;
   SystemThreadInterface iface(thd);
 
-#ifdef __linux__
+#ifdef __linux
   pthread_setname_np(pthread_self(), thd->name.c_str());
+#elif __APPLE__
+  pthread_setname_np(thd->name.c_str());
 #else
   SetThreadDescription(GetCurrentThread(), (LPCWSTR)utf8_string_to_wide_string(thd->name).c_str());
 #endif