Add syntax files from upstream vim repository

compiler/xmlwf.vim

@@ -0,0 +1,27 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim Compiler File
+" Compiler:	xmlwf
+" Maintainer:	Robert Rowsome <rowsome@wam.umd.edu>
+" Last Change:	2004 Mar 27
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "xmlwf"
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+CompilerSet makeprg=xmlwf\ %
+
+CompilerSet errorformat=%f:%l%c:%m
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+endif