0.9.15.9:

0.9.15.9:
        Changes to DISABLE-DEBUGGER:

        * Allow disabling the debugger when *INVOKE-DEBUGGER-HOOK* is non-nil,
          so that --disable-debugger works even when restoring cores where
          that has been done.
        * Store the old value of *I-D-H* when disabling the debugger, and
          restore it back when enabling the debugger.
        * Fix a bug where LDB wouldn't get disabled by --disable-debugger
          if the core had been saved from an sbcl instance where the
          debugger was disabled.