merge revision(s) r47900: [Backport #10035]

	* lib/find.rb (Find.find): Call to_path for arguments to obtain
	  strings.
	  [ruby-core:63713] [Bug #10035] Reported by Herwin.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@47958 b2dd03c8-39d4-4d8f-98ff-823fe69b080e