Log Message:
Update to 0.024

Upstream changes:
0.024     2015-12-24 18:44:29Z
          - remove diagnostics accidentally left in new test

0.023     2015-12-22 06:44:24Z
          - properly handle propagating warnings to previously declared
            handlers that are not coderefs (i.e. a sub name, or the magic
            DEFAULT and IGNORE)

0.022     2015-12-19 00:32:42Z
          - propagate all warnings to any previously-declared __WARN__
            handlers (unlike with __DIE__, merely calling warn() is not
            sufficient)