merge revision(s) 48360,48364: [Backport #10493]

	* ext/etc/etc.c (etc_getlogin): set login name encoding properly.
	  [ruby-core:66163] [Bug #10493]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@48634 b2dd03c8-39d4-4d8f-98ff-823fe69b080e