KWSys 2018-12-12 (abb8c680)

Code extracted from:

    https://gitlab.kitware.com/utils/kwsys.git

at commit abb8c680927708b161f87fb596cefb454ef5e97d (master).

Upstream Shortlog
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Gregor Jasny (1):
      228c60b8 SystemTools: CopyFileAlways: try to create a cheap CoW clone first