fix bug #66816 when validating. don't use sys/time.h if configure did not

* valid.c: fix bug #66816 when validating.
* xmllint.c: don't use sys/time.h if configure did not found it
Daniel
diff --git a/valid.c b/valid.c
index 69584d3..ad22408 100644
--- a/valid.c
+++ b/valid.c
@@ -3938,6 +3938,7 @@
 		    tmp->name = cur->name;
 		    tmp->ns = cur->ns;
 		    tmp->next = NULL;
+		    tmp->content = NULL;
 		    if (repl == NULL)
 			repl = last = tmp;
 		    else {