implemented fix for M$ IIS redirect provided by Ian Hummel fixed problem

* nanohttp.c: implemented fix for M$ IIS redirect provided
  by Ian Hummel
* relaxng.c: fixed problem with notAllowed compilation
  (bug 138793)
diff --git a/relaxng.c b/relaxng.c
index 2715aec..564b459 100644
--- a/relaxng.c
+++ b/relaxng.c
@@ -2959,10 +2959,8 @@
         case XML_RELAXNG_LIST:
         case XML_RELAXNG_PARAM:
         case XML_RELAXNG_VALUE:
-            ret = 0;
-            break;
         case XML_RELAXNG_NOT_ALLOWED:
-            ret = -1;
+            ret = 0;
             break;
     }
     if (ret == 0)