feat(lua): add proper support of luv threads

src/nvim/main.c

@@ -154,10 +154,10 @@ bool event_teardown(void)
 void early_init(mparm_T *paramp)
 {
   env_init();
-  fs_init();
   eval_init();          // init global variables
   init_path(argv0 ? argv0 : "nvim");
   init_normal_cmds();   // Init the table of Normal mode commands.
+  runtime_search_path_init();
   highlight_init();
 
 #ifdef WIN32
@@ -230,6 +230,10 @@ int main(int argc, char **argv)
   // `argc` and `argv` are also copied, so that they can be changed.
   init_params(&params, argc, argv);
 
+  // Since os_open is called during the init_startuptime, we need to call
+  // fs_init before it.
+  fs_init();
+
   init_startuptime(&params);
 
   // Need to find "--clean" before actually parsing arguments.