fix test errors on Windows

* test/resolv/test_addr.rb (test_hosts_by_command): on Windows, `|` is
	  invalid charactor for path and raises `Errno::EINVAL` if trying to
	  open.

	* test/resolv/test_dns.rb (test_resolv_conf_by_command): ditto.

	cf. [Bug #14205]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61374 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/resolv/test_addr.rb

@@ -32,7 +32,7 @@ class TestResolvAddr < Test::Unit::TestCase
     Dir.mktmpdir do |dir|
       Dir.chdir(dir) do
         hosts = Resolv::Hosts.new("|echo error")
-        assert_raise(Errno::ENOENT) do
+        assert_raise(Errno::ENOENT, Errno::EINVAL) do
           hosts.each_name("") {}
         end
       end

test/resolv/test_dns.rb

@@ -182,7 +182,7 @@ class TestResolvDNS < Test::Unit::TestCase
   def test_resolv_conf_by_command
     Dir.mktmpdir do |dir|
       Dir.chdir(dir) do
-        assert_raise(Errno::ENOENT) do
+        assert_raise(Errno::ENOENT, Errno::EINVAL) do
           Resolv::DNS::Config.parse_resolv_conf("|echo foo")
         end
       end