use config-win32 for visual studio builds

disabled 2 libxml settings (CATALOG & ICONV), to get it to compile

Extras/LibXML/include/libxml/xmlversion.h

@@ -218,7 +218,7 @@ XMLPUBFUN void XMLCALL xmlCheckVersion(int version);
  *
  * Whether the Catalog support is configured in
  */
-#if 1
+#if 0
 #define LIBXML_CATALOG_ENABLED
 #endif
 
@@ -263,7 +263,7 @@ XMLPUBFUN void XMLCALL xmlCheckVersion(int version);
  *
  * Whether iconv support is available
  */
-#if 1
+#if 0
 #define LIBXML_ICONV_ENABLED
 #endif
 

Extras/LibXML/libxml.h

@@ -21,8 +21,12 @@
 #if defined(macintosh)
 #include "config-mac.h"
 #else
+#ifdef _MSC_VER
+#include "config-win32.h"
+#else
 #include "config.h"
 #include <libxml/xmlversion.h>
+#endif //_MSVC
 #endif
 
 #if defined(__Lynx__)