Check that files returned from wxDir::FindXXX() match the filter.

Check that files returned from wxDir::FindXXX() match the filter.

Native Windows functions used by wxDir check the filter against both the short
and the long name resulting in unexpected results, e.g. searching for
"foo.baz" would find "foo.bazaar".

Fix this by explicitly rechecking that we have a valid match ourselves.

Closes #3432.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73790 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775