Ignore ^C at interrupt

It's something we don't expect and might be coming from somewhere
else.

Author: nobu

test/io/console/test_io_console.rb

@@ -367,6 +367,7 @@ def assert_ctrl(expect, cc, r, w)
     w.print cc
     w.flush
     result = EnvUtil.timeout(3) {r.gets}
+    result = yield result if defined?(yield)
     assert_equal(expect, result.chomp)
   end
 
@@ -404,7 +405,7 @@ def test_intr
       if cc = ctrl["intr"]
         assert_ctrl("#{cc.ord}", cc, r, w)
         assert_ctrl("#{cc.ord}", cc, r, w)
-        assert_ctrl("Interrupt", cc, r, w) unless /linux/ =~ RUBY_PLATFORM
+        assert_ctrl("Interrupt", cc, r, w) {|res| res.sub("^C", "")} unless /linux/ =~ RUBY_PLATFORM
       end
       if cc = ctrl["dsusp"]
         assert_ctrl("#{cc.ord}", cc, r, w)