`save-lisp-and-die` is still how you do the image dump, but the process here is:

1. compile & load all lisp code

2. dump list of external symbols

3. save-lisp-and-die into a .core file

4. build new SBCL w/ symbols from step #2 linked in (using sbcl.o, which is the SBCL runtime)

5. run new SBCL, using the core from step #3

6. save-lisp-and-die into an executable

edit. fixed formatting