patch for openssl test to suppress message.

test_engine.rb.patch

diff --git a/test/openssl/test_engine.rb b/test/openssl/test_engine.rb
index fce5f76..db80521 100644
--- a/test/openssl/test_engine.rb
+++ b/test/openssl/test_engine.rb
@@ -41,6 +41,10 @@ class OpenSSL::TestEngine < Test::Unit::TestCase
   end
 
   def test_openssl_engine_cipher_rc4
+    # suppress message from OpenSSL
+    tmpfile = Tempfile.new("openssl_cipher_rc4")
+    stderr_back = $stderr.dup
+    $stderr.reopen(tmpfile)
     engine = OpenSSL::Engine.by_id("openssl")
     algo = "RC4" #AES is not supported by openssl Engine (<=1.0.0e)
     data = "a" * 1000
@@ -59,6 +63,10 @@ class OpenSSL::TestEngine < Test::Unit::TestCase
 
     assert_equal(data, decrypted)
     cleanup
+  ensure
+    if stderr_back
+      $stderr.reopen(stderr_back)
+    end
   end
 
   private