Ignore key bindings to methods inherited from Object

[taekop]

Fixes #819

Control-d: exit in inputrc makes wrap_method_call find Kernel#exit through respond_to?(method_symbol, true) and call it with the key string, which raises TypeError and kills the session. Other Object/Kernel methods (abort, sleep, p, raise, ...) are reachable the same way.

This is the small workaround mentioned in the issue: wrap_method_call now skips methods whose owner is Object or one of its ancestors, so such a binding is ignored like any unknown function name. Methods defined on Reline::LineEditor (or a singleton alias, as in test_alias) still dispatch as before.

Not covered: internal LineEditor methods such as initialize or move_history can still be bound; that needs the explicit function registry discussed in the issue.

Testing

• Added test_ignore_method_inherited_from_object to test/reline/test_macro.rb; it fails on master with TypeError and passes with this change.
• bundle exec rake test: 409 tests, 0 failures, 0 errors (23 omissions).
• Manual check on macOS with INPUTRC containing Control-d: exit: master crashes with TypeError on Ctrl-D, with this change the key is ignored and input continues.
• IRB master test suite run against this branch of reline: 410 tests, 0 failures, 0 errors (3 omissions).