MDEV-7450 key management plugins don't work with yassl

workaround, not a fix: don't build key management plugins in yassl builds

mysql-test/suite/plugins/t/show_all_plugins.test

@@ -2,6 +2,7 @@ if (!$DIALOG_EXAMPLES_SO) { skip requires dialog_examples.so; }
 if (!$HA_EXAMPLE_SO) { skip requires ha_examples.so; }
 if (!$LIBDAEMON_EXAMPLE_SO) { skip requires libdaemon_examples.so; }
 if (!$UDF_EXAMPLE_SO) { skip requires udf_example.so; }
+if (!$EXAMPLE_KEY_MANAGEMENT_PLUGIN_SO) { skip requires example_key_management_plugin_so; }
 
 flush status;
 show status like '%libraries%';

plugin/example_key_management_plugin/CMakeLists.txt

 MYSQL_ADD_PLUGIN(EXAMPLE_KEY_MANAGEMENT_PLUGIN example_key_management_plugin.cc
-                 MODULE_ONLY)
+  MODULE_ONLY ONLY_IF HAVE_EncryptAes128Ctr)

plugin/file_key_management_plugin/CMakeLists.txt

 SET(FILE_KEY_MANAGEMENT_PLUGIN_SOURCES file_key_management_plugin.cc EncKeys.cc KeySingleton.cc)
 
+IF(NOT SSL_SOURCES)
+  SET(USING_OPENSSL ON)
+ENDIF()
+
 MYSQL_ADD_PLUGIN(FILE_KEY_MANAGEMENT_PLUGIN ${FILE_KEY_MANAGEMENT_PLUGIN_SOURCES}
-                 LINK_LIBRARIES pcre)
+  LINK_LIBRARIES pcre ONLY_IF USING_OPENSSL)