KWSys 2015-09-25 (dc4e4a55)

Extract upstream KWSys using the following shell commands.

$ git archive --prefix=upstream-kwsys/ dc4e4a55 | tar x
$ git shortlog --no-merges --abbrev=8 --format='%h %s' cfeb27cc..dc4e4a55
Ben Boeckel (1):
      dd466688 CTestCustom: use list(APPEND)

Domen Vrankar (1):
      dc4e4a55 SystemTools: Handle directories in CopyFile{Always,IfDifferent}