[Ecls-list] SIGINT and *debugger-hook*

[dherring at tentpost.com]

Hi,

After embedding ECL in an application, I noticed that it installs a signal
handler for SIGINT that invokes the ECL debugger.

This may confuse users who don't know ECL is being used, so I tried (setf
*debugger-hook* ...) to customize the default behavior.

This works when ECL is started as a top-level process (e.g. `ecl`) but not
when ECL is started from within my app via cl_boot(argc, argv).

Suggestions?

Thanks,
Daniel