Add syntax files from upstream vim repository

syntax/xbl.vim

@@ -0,0 +1,33 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim syntax file
+" Language:	    XBL 1.0
+" Maintainer:	    Doug Kearns <dougkearns@gmail.com>
+" Latest Revision:  2007 November 5
+
+if exists("b:current_syntax")
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+runtime! syntax/xml.vim
+unlet b:current_syntax
+
+syn include @javascriptTop syntax/javascript.vim
+unlet b:current_syntax
+
+syn region xblJavascript
+	\ matchgroup=xmlCdataStart start=+<!\[CDATA\[+
+	\ matchgroup=xmlCdataEnd end=+]]>+
+	\ contains=@javascriptTop keepend extend
+
+let b:current_syntax = "xbl"
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim: ts=8
+
+endif