KWSys 2021-09-15 (2c4a8330)

Code extracted from:

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

at commit 2c4a83304e08c3e5e17d400315d6f1253f1f7bbc (master).

Upstream Shortlog

Laurent Malka (1): 6ccbfc12 SystemTools: Add a Join function

ulatekh (1): 4ef5b106 SystemTools: Ensure Windows Vista APIs are available before using them