fixes for Windows from Igor Daniel

* include/libxml/debugXML.h win32/dsp/libxml2.def.src: fixes
  for Windows from Igor
Daniel
diff --git a/include/libxml/debugXML.h b/include/libxml/debugXML.h
index 347c42c..32b40ce 100644
--- a/include/libxml/debugXML.h
+++ b/include/libxml/debugXML.h
@@ -50,7 +50,7 @@
 void	xmlLsOneNode		(FILE *output, xmlNodePtr node);
 int	xmlLsCountNode		(xmlNodePtr node);
 
-const char *xmlBoolToText	(int boolval);
+LIBXML_DLL_IMPORT const char *xmlBoolToText	(int boolval);
 
 /****************************************************************
  *								*