test_io.rb: EINVAL on Windows

* test/ruby/test_io.rb (test_read_command): unusable character
  causes Errno::EINVAL on Windows.

From: Nobuyoshi Nakada <nobu@ruby-lang.org>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61321 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_io.rb

@@ -2192,10 +2192,10 @@ class TestIO < Test::Unit::TestCase
     assert_warn(/invoke external command/) do
       File.binread("|#{EnvUtil.rubybin} -e puts")
     end
-    assert_raise(Errno::ENOENT) do
+    assert_raise(Errno::ENOENT, Errno::EINVAL) do
       Class.new(IO).read("|#{EnvUtil.rubybin} -e puts")
     end
-    assert_raise(Errno::ENOENT) do
+    assert_raise(Errno::ENOENT, Errno::EINVAL) do
       Class.new(IO).binread("|#{EnvUtil.rubybin} -e puts")
     end
   end