vim-patch:8.0.0704: problems with autocommands when opening help

Problem:    Problems with autocommands when opening help.
Solution:   Avoid using invalid "varp" value.  Allow using :wincmd if buffer
            is locked. (closes vim/vim#1806, closes vim/vim#1804)
163095f088

src/nvim/ex_cmds.lua

@@ -3076,7 +3076,7 @@ return {
   },
   {
     command='wincmd',
-    flags=bit.bor(NEEDARG, WORD1, RANGE, NOTADR),
+    flags=bit.bor(NEEDARG, WORD1, RANGE, NOTADR, CMDWIN),
     addr_type=ADDR_WINDOWS,
     func='ex_wincmd',
   },