18.104.22.168: make-target-2.lisp split into compile and dump phases.
* Split make-target-2.lisp into make-target-2.lisp and
make-target-2-load.lisp, reducing unnecessary state that was kept around.
Not keeping symbols that were interned during the compilation of PCL
saves us 400kB on x86 and between 1MB and 1.5MB on x86_86.
* Unintern symbols that are internal to CL-USER before dumping the core.
This doesn't save any space; just removes confusion.