fixed a number of warnings shown by HP-UX compiler and reported by Rick

* HTMLparser.c configure.in parserInternals.c runsuite.c runtest.c
  testapi.c xmlschemas.c xmlschemastypes.c xmlstring.c: fixed a number
  of warnings shown by HP-UX compiler and reported by Rick Jones
Daniel
diff --git a/parserInternals.c b/parserInternals.c
index aad43bc..9e9e03f 100644
--- a/parserInternals.c
+++ b/parserInternals.c
@@ -1880,7 +1880,7 @@
     int found = 0;
 
     if ((seq == NULL) || (node == NULL))
-        return (-1);
+        return ((unsigned long) -1);
 
     /* Do a binary search for the key */
     lower = 1;