include: Remove duplicate definition of WS_XML_NODE_POSITION.

include/webservices.h

@@ -73,7 +73,6 @@ typedef struct _WS_CUSTOM_HTTP_PROXY WS_CUSTOM_HTTP_PROXY;
 typedef struct _WS_HTTP_MESSAGE_MAPPING WS_HTTP_MESSAGE_MAPPING;
 typedef struct _WS_HTTP_HEADER_MAPPING WS_HTTP_HEADER_MAPPING;
 typedef struct _WS_HTTP_REDIRECT_CALLBACK_CONTEXT WS_HTTP_REDIRECT_CALLBACK_CONTEXT;
-typedef struct _WS_XML_NODE_POSITION WS_XML_NODE_POSITION;
 
 struct _WS_STRUCT_DESCRIPTION;
 struct _WS_XML_STRING;