Update runtime files

runtime/compiler/zsh.vim

@@ -0,0 +1,23 @@
+" Vim compiler file
+" Compiler:	Zsh
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2020 Sep 6
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "zsh"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+CompilerSet makeprg=zsh\ -n\ --\ %:S
+CompilerSet errorformat=%f:\ line\ %l:\ %m,
+		       \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save