* tests/gpgscm/ffi.scm (throw): Run *run-atexit-handlers* when
terminating the interpreter.
(*atexit-handlers*): New variable.
(*run-atexit-handlers*): New function.
(atexit): Likewise.
* tests/gpgscm/main.c (main): Run *run-atexit-handlers* at normal
interpreter shutdown.