test_io_console.rb: ignore echo back

* test/io/console/test_io_console.rb (test_getpass): ignore echo
  back of input from the master side.  some systems seem echo back
  but other may not.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52998 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/io/console/test_io_console.rb

@@ -185,7 +185,7 @@ class TestIO_Console < Test::Unit::TestCase
     run_pty("p IO.console.getpass('> ')") do |r, w|
       assert_equal("> ", r.readpartial(10))
       w.print "asdf\n"
-      assert_equal("\r\n", r.gets)
+      assert_include(r.gets, "\n")
       assert_equal("\"asdf\"", r.gets.chomp)
     end
   end