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/configure.in b/configure.in
index 4667901..c3d33b1 100644
--- a/configure.in
+++ b/configure.in
@@ -182,6 +182,9 @@
     *-*-solaris*)
         XML_LIBDIR="${XML_LIBDIR} -R${libdir}"
         ;;
+    hppa*-hp-mpeix)
+        NEED_TRIO=1
+	;;
 esac