merge revision(s) r45471: [Backport #9688]

	* win32/win32.c (rb_w32_accept, open_ifs_socket, socketpair_internal):
	  reset inherit flag of socket to avoid unintentional inheritance of
	  socket.  note that the return value of SetHandleInformation() is not
	  verified intentionally because old Windows may return an error.
	  [Bug #9688] [ruby-core:61754]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46305 b2dd03c8-39d4-4d8f-98ff-823fe69b080e