KWSys 2020-05-18 (146f6b36)

Code extracted from:

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

at commit 146f6b36442dec7a3315f5bfc4e3d71ffa943e53 (master).

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

Brad King (2):
      e093a985 Glob: Append warning message only if destination is non-null
      25775078 Glob: Do not warn if top-level directory does not exist

Dmitry Kalinkin (3):
      9a3f9799 Directory: implement error reporting
      f33ef4e3 Glob: issue warnings on Directory errors
      97f880e6 Directory: add extra tests involving errorMessage