MSXML: Fixed msxml compilation when libxml is not available.

[Jacek Caban]

Changelog:
   Fixed msxml compilation when libxml2 is not available.
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Index: dlls/msxml3/nodemap.c
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RCS file: /home/wine/wine/dlls/msxml3/nodemap.c,v
retrieving revision 1.1
diff -u -p -r1.1 nodemap.c
--- dlls/msxml3/nodemap.c	8 Aug 2005 15:04:00 -0000	1.1
+++ dlls/msxml3/nodemap.c	8 Aug 2005 16:25:55 -0000
@@ -39,6 +39,8 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msxml);
 
+#ifdef HAVE_LIBXML2
+
 typedef struct _xmlnodemap
 {
     const struct IXMLDOMNamedNodeMapVtbl *lpVtbl;
@@ -279,3 +281,5 @@ HRESULT NodeMap_create( IXMLDOMNamedNode
 
     return S_OK;
 }
+
+#endif