move process_initialized assignment to after thread initialization (see also issue #1209)

Author: daanx

src/init.c

@@ -943,7 +943,6 @@ void mi_process_init(void) mi_attr_noexcept {
 	// mi_heap_main_init(); // vs2017 can dynamically re-initialize theap_main
 	// #endif
   if (!mi_atomic_once(&process_init)) return;
-  _mi_process_is_initialized = true;
   _mi_verbose_message("process init: 0x%zx\n", _mi_thread_id());
 
   mi_detect_cpu_features();
@@ -955,6 +954,7 @@ void mi_process_init(void) mi_attr_noexcept {
   mi_heap_main_init(); // before page_map_init so stats are working
   _mi_page_map_init(); // todo: this could fail.. should we abort in that case?
   mi_thread_init();
+  _mi_process_is_initialized = true;
 
   #if defined(_WIN32) && defined(MI_WIN_USE_FLS)
   // On windows, when building as a static lib the FLS cleanup happens to early for the main thread.