KWSys 2020-05-13 (d4da6980)

Code extracted from:

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

at commit d4da69800d9103a7d3654f9428386a914ba280f2 (master).

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

Sean McBride (5):
      c58d4b47 SystemTools: On Windows, strip 'e' from Fopen mode
      cb541c31 Auto-fixed various clang-tidy warnings
      2c179921 Applied clang-tidy modernize-deprecated-headers
      775296c8 Applied clang-tidy bugprone-suspicious-string-compare fixes
      a19f0ac6 Fixed clang -Wstrict-prototypes warning