* lib/irb/ext/save-history.rb: outputs its history to
	  owner-only-readable file and change the permission of a file that
	  already exists [Bug #7694]. Thanks Nobuhiro IMAI for bug reports.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e