DragonFlyBSD/src a9358b2sys/conf kern.pre.mk

kern.pre.mk: Add back some Makefile code to fix VKERNEL64.

I removed this by mistake in c47c81dbc5495f8c4fa01a238784813eb56a239e.

Seems this is still needed, even though we inherited it from FreeBSD
before we had the vkernel.

Reported-by: tuxillo
DeltaFile
+6-0sys/conf/kern.pre.mk
+6-01 files

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