compile-file: incremental expansion of top-level forms.

Harmonizing with the previous change to eval, the
compiler should also handle those situations.

* share/txr/stdlib/compiler.tl (compile-file): do not perform
a full expansion on each object that it reads from the file
before passing it into the top-level walk. Rather, the
raw form is passed into the top-level walk. It is partially
expanded with macro-expand, and this is repated at each
descent of the recursion. Only forms which are not top-level
forms are then fully expanded before compilation, by not
passing the t argument to compile-toplevel.

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