port r14776 from 1.2: hwloc leak

tools/valgrind/hwloc.suppr

@@ -18,3 +18,11 @@
    ...
    fun:xmlDictCreate
 }
+
+{
+   libtool leaves memory behind
+   Memcheck:Leak
+   fun:malloc
+   ...
+   fun:lt_dlopenadvise
+}