Snippets for wxwidgets 3.2.8.1 from FreeBSD 150arm64

Sourced from https://pkg-status.freebsd.org/ampere5/data/latest-per-pkg/wx32-gtk3/3.2.8.1_1/150arm64-default.log.

• ./src/html/chm.cpp:512:14: warning: unused variable 'mode_str' [-Wunused-variable]
    512 |     wxString mode_str;
        |              ^~~~~~~~