KWSys 2019-05-30 (f892bacf)

Code extracted from:

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

at commit f892bacf6c563b1f6fb843ffb623b434bc2ded4f (master).

Upstream Shortlog
-----------------

Zsolt Parragi (1):
      887b1da5 Fixing issues when building with clang 8.0 on Windows