DragonFlyBSD/src 73f5f70. Makefile_upgrade.inc, sys/platform/pc64/x86_64 support.s

Remove kernbb(8).

It likely never worked in DragonFly (or until some early compiler
upgrade). FreeBSD stopped building it in 2004 (r132787).

Reported-by: zrj
DeltaFile
+0-136usr.sbin/kernbb/kernbb.c
+0-69usr.sbin/kernbb/kernbb.8
+0-19sys/platform/pc64/x86_64/support.s
+0-10usr.sbin/kernbb/Makefile
+2-0Makefile_upgrade.inc
+0-1usr.sbin/Makefile
+2-2356 files

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