vim-patch:partial:cfa8f9a3f285 (#18858)

Update runtime files
cfa8f9a3f2

skip syntax/vim.vim (needs 8.2.4770)
skip doc/syntax.vim (needs several colorscheme patches)
skip further rewrite of manual

runtime/ftplugin/confini.vim

@@ -0,0 +1,10 @@
+" Vim filetype plugin file
+" Language: confini
+
+" Quit if a ftplugin file was already loaded
+if exists("b:did_ftplugin")
+  finish
+endif
+
+" Use the cfg plugin, it's similar enough.
+runtime! ftplugin/cfg.vim