Fix malloc_hooks for hooks_write_malloc_leak_info.

Change-Id: I99f9ee0221bc7bbb5e7dd173ae5a6007f0fa871d
diff --git a/libc/malloc_hooks/exported64.map b/libc/malloc_hooks/exported64.map
index 5ebcf9f..72465c4 100644
--- a/libc/malloc_hooks/exported64.map
+++ b/libc/malloc_hooks/exported64.map
@@ -18,6 +18,7 @@
     hooks_memalign;
     hooks_posix_memalign;
     hooks_realloc;
+    hooks_write_malloc_leak_info;
 
   local:
     *;