* pattern.c xpath.c include/libxml/pattern.h:
  Fixed bug #322928, reported by Erich Schubert: The bug was
  in pattern.c, which is used for a tiny subset of xpath
  expression which can be evaluated in an optimized way.
  The doc-node was never considered when evaluating "//"
  expressions. Additionally, we fixed resolution
  to nodes of any type in pattern.c; i.e. a "//." didn't work
  yet, as it did select only element-nodes. Due to this
  issue the pushing of nodes in xpath.c needed to be adjusted
  as well.