byte-compile messages should be prefixed with "Warning:" or "Error:"

[Dan Jacobson]

It would be good if the emacs lisp byte compiler prefixed its messages
with "Warning:" or "Error:", like other compilers do, so the user can
get a better handle on the seriousness of the problem encountered.
E.g., in

emacs -no-site-file -no-init-file -batch -q -f batch-byte-compile ./bbdb.el
While compiling the end of the data in file 
/home/jidanni/tmp/bbdb-2.2/lisp/bbdb.el:
  ** The following functions are not known to be defined: caddr,
    set-keymap-prompt
Wrote /home/jidanni/tmp/bbdb-2.2/lisp/bbdb.elc

it seems this is a mere "Warning" of a not so serious problem, but
that is a guess, and it would be nice if emacs would be more forthcoming.
-- 
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