[bsd.hardening.mk] Use '-Wbidi-chars' with GCC12.
GCC 12 add a warning flag to Help Fend Off Trojan Source Attacks.
See: https://developers.redhat.com/articles/2022/01/12/prevent-trojan-source-attacks-gcc-12
GCC 12 add a warning flag to Help Fend Off Trojan Source Attacks.
See: https://developers.redhat.com/articles/2022/01/12/prevent-trojan-source-attacks-gcc-12