[tlbuild] ./Build failure in xindy on macOS Sonoma, 14.2.1, with TL '24 dev sources

[Karl Berry]

    I have to give the undocumented parameter CLISP=/opt/local/bin/clisp
    to overcome this behaviour.

Ok, I'll add something about it to configure --help.

The CLISP var is currently mentioned on
https://tug.org/texlive/build.html#xindy
and
https://tug.org/texinfohtml/tlbuild.html#Variables-for-configure

Best,
Karl