Yon Derek provided a first fix to be able to compile libxslt/xsltproc on

* include/win32config.h: Yon Derek provided a first fix
  to be able to compile libxslt/xsltproc on Windows
Daniel
diff --git a/include/win32config.h b/include/win32config.h
index 5de4735..87ce2b0 100644
--- a/include/win32config.h
+++ b/include/win32config.h
@@ -1,3 +1,6 @@
+#ifndef __LIBXML_WIN32_CONFIG__
+#define __LIBXML_WIN32_CONFIG__
+
 #define HAVE_CTYPE_H
 #define HAVE_STDLIB_H
 #define HAVE_MALLOC_H
@@ -6,7 +9,9 @@
 
 #include <io.h>
 
+#ifndef LIBXML_DLL_IMPORT
 #define LIBXML_DLL_IMPORT
+#endif
 #define SOCKLEN_T int
 
 #ifdef NEED_SOCKETS
@@ -101,3 +106,5 @@
 #endif /* WITH_TRIO */
 #endif /* _MSC_VER */
 
+#endif /* __LIBXML_WIN32_CONFIG__ */
+