merge revision(s) 40561: [Backport #8357]

	* object.c (rb_obj_is_kind_of): skip prepending modules.
	  [ruby-core:54742] [Bug #8357]

	* object.c (rb_class_inherited_p): ditto.
	  [ruby-core:54736] [Bug #8357]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40575 b2dd03c8-39d4-4d8f-98ff-823fe69b080e