Snippets for fcitx5-mcbopomofo 3.1 from FreeBSD 150amd64

Sourced from https://pkg-status.freebsd.org/beefy23/data/latest-per-pkg/zh-fcitx5-mcbopomofo/3.1/150amd64-default.log.

• /wrkdirs/usr/ports/chinese/fcitx5-mcbopomofo/work/fcitx5-mcbopomofo-3.1/src/KeyHandler.cpp:54:18: warning: unused variable 'kMaxRomanNumberConversionDigits' [-Wunused-const-variable]
     54 | constexpr size_t kMaxRomanNumberConversionDigits = 4;
        |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~