Merge topic 'findtbb-improvements'

05a7a792 FindTBB: fix typo in comments
b20caa1f FindTBB: remove variable deref in if() commands
7e3e5f3d FindTBB: empty out end*() commands
8b776407 FindTBB: use foreach (IN LISTS)

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1368