Log Message:
lang/gcc-aux: bug fix

This commit achieves the following:
  1) Fix specific case of falsely identified aggregate array index
     duplicates.  Fix taken from gcc 4.8 source, it apparently will
     never be backported.
  2) Fix typo that caused mktemp to be used in DragonFly
  3) Incorporate NetBSD libstdc++ fixes into gcc-aux repository
     (which is a parallel fork) and regenerate diff-cxx.  This
     enables patches to be removed.