KWSys 2016-03-08 (6b60c184)

Code extracted from:

    http://public.kitware.com/KWSys.git

at commit 6b60c1843dbba9d4929496f9292cc78dab945c68 (master).

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

Mariusz Pluciński (1):
      6b60c184 SystemInformation: Fix compilation on VS Clang/C2 toolset

Sean McBride (3):
      6ea22e65 Suppressed clang -Wcomma warnings with void cast
      8d9d489d Fixed clang-tidy warnings about macros missing defensive parens
      1c544330 Made private method static to silence warning