test_old_thread_select.rb: ignore short wait on Windows

* test/-ext-/old_thread_select/test_old_thread_select.rb
  (test_old_select_signal_safe): ignore short wait on Windows.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43154 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/-ext-/old_thread_select/test_old_thread_select.rb

@@ -5,6 +5,7 @@ class TestOldThreadSelect < Test::Unit::TestCase
 
   ANCIENT_LINUX = RUBY_PLATFORM =~ /linux/ && `uname -r`.chomp < '2.6.32'
   DARWIN_10     = RUBY_PLATFORM =~ /darwin10/
+  WINDOWS       = RUBY_PLATFORM =~ /mswin|mingw/
 
   def with_pipe
     r, w = IO.pipe
@@ -88,7 +89,7 @@ class TestOldThreadSelect < Test::Unit::TestCase
       end
     end
 
-    unless ANCIENT_LINUX || DARWIN_10
+    unless ANCIENT_LINUX || DARWIN_10 || WINDOWS
       assert_operator diff, :>=, 1, "interrupted or short wait: diff=#{diff}"
     end
     assert_equal 0, rc