dump-image should not make CLISP images executable

[Pierre Neidhardt]

Thank you!

I believe both Fahree and Eric are making fare points.

If executables it's going to be, then I suggest the following:

- Update the docstring to explain that executables are always generated,
  and why.

- Optional: Supersede `dump-image` with a new `dump-executable` which
  would be less misleading :)

Cheers!

-- 
Pierre Neidhardt
https://ambrevar.xyz/
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