runtime(vim): include Vim Syntax generator

fixes: #13939
closes: #14021
related: vim-jp/syntax-vim-ex#28

Signed-off-by: h-east <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/generator/update_date.vim

@@ -0,0 +1,14 @@
+" Update the date of following line in vim.vim.rc.
+"     '" Last Change:  '
+"
+language C
+silent new vim.vim
+normal gg
+let pat = '^"\s*Last\s*Change:\s\+'
+let lnum = search(pat, 'We', 10)
+if lnum > 0
+   exec 'norm! lD"=strftime("%b %d, %Y")' . "\rp"
+   silent update
+endif
+quitall!
+" vim:ts=4 sw=4 et