[ruby/openssl] test/openssl/test_ssl.rb: do not run SSL tests if not available

https://github.com/ruby/openssl/commit/a3d230d4e0

test/openssl/test_pair.rb

@@ -2,7 +2,7 @@
 require_relative 'utils'
 require_relative 'ut_eof'
 
-if defined?(OpenSSL)
+if defined?(OpenSSL::SSL)
 
 module OpenSSL::SSLPairM
   def setup

test/openssl/test_ssl.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 require_relative "utils"
 
-if defined?(OpenSSL)
+if defined?(OpenSSL::SSL)
 
 class OpenSSL::TestSSL < OpenSSL::SSLTestCase
   def test_bad_socket

test/openssl/test_ssl_session.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 require_relative "utils"
 
-if defined?(OpenSSL)
+if defined?(OpenSSL::SSL)
 
 class OpenSSL::TestSSLSession < OpenSSL::SSLTestCase
   def test_session