ASDF resolve-symlinks when *load-truename* is nil.

Hi,

I was wondering if it made sense to add an ASSERT in RESOLVE-SYMLINKS
which made sure path was a pathname and hinted to the user that they
are probably not LOADing the defsystem like they should?  Or perhaps
checking for nil would be better.  Or maybe moving it into defsystem
to check there, I don't know.  If there's support for this I'll write
a patch for whichever way you prefer.

Something like:

(defun resolve-symlinks (path)
  (assert (pathnamep path) () "defsystems must be LOADed from a file,
it looks like you are EVAL'ing a defsystem form.")
  #-allegro (truename path)
  #+allegro (excl:pathname-resolve-symbolic-links path)
  )

Thanks,
Erik.

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