All files in svn are supposed to use UTF-8 now so convert this one to UTF-8
too before committing more changes to it (which would be otherwise rejected by
pre-commit hook).
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62140 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775