MFH: r481660

Mark BROKEN: fails to build

_/wrkdirs/usr/ports/security/kr/work/kr-2.3.1/kr

github.com/kryptco/kr/vendor/github.com/kryptco/go-crypto/blake2b.supportsAVX2: relocation target runtime.support_avx2 not defined
github.com/kryptco/kr/vendor/github.com/kryptco/go-crypto/blake2b.supportsAVX: relocation target runtime.support_avx not defined

Reported by: pkg-fallout