Merge topic 'findwxwidgets-mingw-regression'

7d6e01801d FindwxWidgets: Do not reset wxWidgets_LIB_DIR unnecessarily
6dce42b171 FindwxWidgets: Restore win32 find style on MinGW

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !7451