merge revision(s) r45423,r45424: [Backport #9674]

	* ext/thread/thread.c (undumpable): ConditionVariable and Queue
	  are not dumpable.  [ruby-core:61677] [Bug #9674]

	* marshal.c (w_object): internal objects are not dumpable.
	  [ruby-core:61677] [Bug #9674]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46805 b2dd03c8-39d4-4d8f-98ff-823fe69b080e