Explicitly set 'cpo' in syntax file

Syntax file was missing standard 'cpo' boilerplate.

Spotted by Bram Moolenaar:

https://groups.google.com/d/msg/vim_dev/gf9bpbV6wyo/UaPKCn2eAgAJ

Author: guns

syntax/clojure.vim

@@ -15,6 +15,9 @@ if exists("b:current_syntax")
 	finish
 endif
 
+let s:cpo_sav = &cpo
+set cpo&vim
+
 if has("folding") && exists("g:clojure_fold") && g:clojure_fold > 0
 	setlocal foldmethod=syntax
 endif
@@ -214,4 +217,7 @@ highlight default link clojureParen                     Delimiter
 
 let b:current_syntax = "clojure"
 
+let &cpo = s:cpo_sav
+unlet! s:cpo_sav
+
 " vim:sts=8:sw=8:ts=8:noet