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Avoid duplicate call to lisp-implementation-version
The way that lisp-version-string is written, it will fall back to lisp-implementation-version unless a platform-specific override is provided. Since the body of lisp-version-string uses (car (list #+foo exp1 exp2)) rather than (or #+foo exp1 exp2) it is theoretically possible that lisp-version-string would return NIL if that's what exp1 evaluates to, which would not also be returned by lisp-implementation-version, which it previously would not have. Such behaviour would qualify as a bug in lisp-version-string, though.
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