move authentication_windows_client and mysql_clear_password clear client auth plugins

out of libmysql into separate dynamic plugins in the plugin/ directory.

move dialog and auth_socket plugins out of the plugin directory with examples into
dedicated directories in plugin/

plugin/win_auth_client/plugin_client.cc

@@ -0,0 +1,68 @@
+/* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include <my_global.h>
+#include <mysql.h>
+#include <mysql/plugin_auth.h>
+#include <mysql/client_plugin.h>
+
+#include "common.h"
+
+/*
+  The following MS C++ specific pragma embeds a comment in the resulting
+  object file. A "lib" comment tells the linker to use the specified 
+  library, thus the dependency is handled automagically.
+*/
+
+#ifdef _MSC_VER
+#pragma comment(lib, "Secur32")
+#endif
+
+static int win_auth_client_plugin_init(char*, size_t, int, va_list)
+{
+  return 0;
+}
+
+
+static int win_auth_client_plugin_deinit()
+{
+  return 0;
+}
+
+
+int win_auth_handshake_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql);
+
+
+/*
+  Client plugin declaration. This is added to mysql_client_builtins[]
+  in sql-common/client.c
+*/
+
+extern "C"
+st_mysql_client_plugin_AUTHENTICATION win_auth_client_plugin=
+{
+  MYSQL_CLIENT_AUTHENTICATION_PLUGIN,
+  MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION,
+  "authentication_windows_client",
+  "Rafal Somla",
+  "Windows Authentication Plugin - client side",
+  {0,1,0},
+  "GPL",
+  NULL,
+  win_auth_client_plugin_init,
+  win_auth_client_plugin_deinit,
+  NULL,                            // option handling
+  win_auth_handshake_client
+};