Merge branch 'dev' into dev2

src/init.c

@@ -569,6 +569,9 @@ void _mi_heap_set_default_direct(mi_heap_t* heap)  {
   _mi_prim_thread_associate_default_heap(heap);
 }
 
+void mi_thread_set_in_threadpool(void) mi_attr_noexcept {
+  // nothing
+}
 
 // --------------------------------------------------------
 // Run functions on process init/done, and thread init/done