close bug #61550 when xml: wasn't considered a namespace daniel

* valid.c: close bug #61550 when xml: wasn't considered a namespace
daniel
diff --git a/valid.c b/valid.c
index 29bfcfa..723ada4 100644
--- a/valid.c
+++ b/valid.c
@@ -344,10 +344,12 @@
 
     *prefix = NULL;
 
+#ifndef XML_XML_NAMESPACE
     /* xml: prefix is not really a namespace */
     if ((name[0] == 'x') && (name[1] == 'm') &&
         (name[2] == 'l') && (name[3] == ':'))
 	return(NULL);
+#endif
 
     /* nasty but valid */
     if (name[0] == ':')