[tlbuild] building clisp

[Karl Berry]

    one question: are these warnings something to fix?
    clisp-2.44.1/src/lispbibl.d:9023: warning: volatile register
    variables don't work as you might wish

What a helpful message :).

I doubt it's anything to worry about.  If you like, report to
bruno at clisp.org and sds at podval.org (clisp maintainers; or find a clisp
bug list) along with compiler version, system info, etc.

Best,
karl