make atomics and threads include cia/def and rt when they depend on it

include/stdatomic.h

@@ -1,6 +1,7 @@
 
 #pragma once
 
+#include <cia/def.h>
 #include <wchar.h>
 #include <stddef.h>
 

include/threads.h

@@ -1,6 +1,9 @@
 
 #pragma once
 
+#include <cia/def.h>
+#include <tinyrt.h>
+
 typedef int (*thrd_start_t)(void *);
 
 struct thrd_t typedef thrd_t;