vim-patch:8.1.2047: cannot check the current state

Problem:    Cannot check the current state.
Solution:   Add the state() function.

0e57dd859e

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/generators/gen_eval.lua

@@ -36,6 +36,7 @@ hashpipe:write([[
 #include "nvim/quickfix.h"
 #include "nvim/runtime.h"
 #include "nvim/search.h"
+#include "nvim/state.h"
 #include "nvim/strings.h"
 #include "nvim/sign.h"
 #include "nvim/testing.h"