KWSys 2018-10-19 (c2f29d2e)

Code extracted from:

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

at commit c2f29d2e929e58e36b4986d3ff5364a0d825cfca (master).

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

Ben Boeckel (1):
      a5caf8a4 cmake: support an alias target

Modestas Vainius (1):
      162b3ed7 SystemInformation: Fix compilation on GNU/{kFreeBSD,Hurd}