fixed configure for MPE/iX from Markus Henke fixed initialization problems

* configure.in: fixed configure for MPE/iX from Markus Henke
* xmlmemory.c: fixed initialization problems
* xpath.c: another set of patches from Richard Jinks this
  fixes "make XPathtests" on linux
Daniel
diff --git a/xmlmemory.c b/xmlmemory.c
index 890ab7b..0079f23 100644
--- a/xmlmemory.c
+++ b/xmlmemory.c
@@ -711,6 +711,9 @@
      xmlGenericError(xmlGenericErrorContext,
 	     "xmlInitMemory() Ok\n");
 #endif     
+     xmlMemInitialized = 1;
+     xmlInitMemoryDone = 1;
+
      ret = 0;
      return(ret);
 }