Diffusion FreeBSD src repository aea2a658ef8b

Don't delete hack.c - causes perpetual 'out of date' kernel
aea2a658ef8b
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Description

Don't delete hack.c - causes perpetual 'out of date' kernel

Deleting hack.c cause the kernel to always be out of date:

   $ make kernel
   make: /usr/src/sys/amd64/compile/GENERIC/.depend.hack.pico, 1:
	     ignoring stale .depend for hack.c
   :> hack.c
   cc -shared -O2 -pipe ... -nostdlib hack.c -o hack.pico
   rm -f hack.c
   MAKE="make" sh ../../../conf/newvers.sh "-R" GENERIC
   cc -c -O2 -pipe ...  -std=iso9899:1999 -Werror  vers.c
   ctfconvert -L VERSION -g vers.o
   linking kernel.full

Keeping hack.c in the compile directory causes no harm,
so there's no reason to delete it.

Also rename the file to "force-dyamic-hack.c" so it is
clear what the hack is aboug.

Reviewed by: sjg
Differential Revision: https://reviews.freebsd.org/D34281