Merge topic 'FindwxWidgets-vs-2017'

8f207df1 FindwxWidgets: Add support for VS 2017 v141 toolset
73f7d266 FindwxWidgets: Use `MSVC_VERSION` instead of `MSVC##`

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !608