Fix binary fixture test on Windows

[#2597 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

activerecord/test/cases/fixtures_test.rb

@@ -185,7 +185,7 @@ def test_subsubdir_file_with_arbitrary_name
 
   def test_binary_in_fixtures
     assert_equal 1, @binaries.size
-    data = File.read(ASSETS_ROOT + "/flowers.jpg")
+    data = File.open(ASSETS_ROOT + "/flowers.jpg", 'rb') { |f| f.read }
     data.force_encoding('ASCII-8BIT') if data.respond_to?(:force_encoding)
     data.freeze
     assert_equal data, @flowers.data