adding xmlNanoFTPDele() from Philipp Dunkel Daniel

* nanoftp.c include/libxml/nanoftp.h: adding xmlNanoFTPDele()
  from Philipp Dunkel
Daniel
diff --git a/include/libxml/nanoftp.h b/include/libxml/nanoftp.h
index a0ba2ce..f19194d 100644
--- a/include/libxml/nanoftp.h
+++ b/include/libxml/nanoftp.h
@@ -93,6 +93,8 @@
  */
 int	xmlNanoFTPCwd		(void *ctx,
 				 char *directory);
+int	xmlNanoFTPDele		(void *ctx,
+				 char *file);
 
 int	xmlNanoFTPGetConnection	(void *ctx);
 int	xmlNanoFTPCloseConnection(void *ctx);