KWSys 2017-12-15 (8f755ee9)

Code extracted from:

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

at commit 8f755ee93451e580aa7b5ed6cee9e6c5da81e7d0 (master).

Upstream Shortlog
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Volo Zyko (1):
      9f6cd407 SystemTools: Fix removing of soft links to directories on Windows.