merge revision(s) r47153: [Backport #10127]

	* ext/win32ole/win32ole.c (ole_create_dcom): use the converted
	  result if the argument can be converted to a string, to get rid
	  of invalid access. Thanks to nobu. [ruby-dev:48467] [Bug #10127]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@47325 b2dd03c8-39d4-4d8f-98ff-823fe69b080e