Oops, I forgot to squash the patch and only sent the second part :x
Anyways, it is trivial:

```
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -432,7 +432,7 @@ native_thread_destroy(rb_thread_t *th)
 }
 
 #ifndef USE_THREAD_CACHE
-#define USE_THREAD_CACHE 0
+#define USE_THREAD_CACHE 1
 #endif
 
 #if USE_THREAD_CACHE
```

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