builtin redefinition: better diagnostic message.

The motivation here is that if we define, say, a macro whose
name is the same as a built-in function, we get a warning
which misleadingly uses the word "redefining".

* eval.c (builtin_reject_test): Add a new parameter which
indicates what kind of binding is being defined. This has the
same values as the builtin hash. If the builtin hash reports
that the symbol is a builtin, we can issue one of two
diagnostic messages based on whether the one being defined is
of the same kind or noto.
(expand_macrolet): Pass the defmacro symbol to
builtin_reject_test, since macros are being defined.
(expand_fbind_vars): Pass the defun symbol symbol to
builtin_reject_test.
(do_expand): In the defun/defmacro case, pass the operator in
question to builtin_reject_test.

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