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/CMakeLists.txt

@@ -0,0 +1,34 @@
+# 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+
+IF(WIN32)
+  #
+  # Configuration for building Windows Authentication Plugin (client-side)
+  #
+
+  ADD_DEFINITIONS(-DSECURITY_WIN32)
+  ADD_DEFINITIONS(-DDEBUG_ERRROR_LOG)  # no error logging in production builds
+  #ADD_DEFINITIONS(-DWINAUTH_USE_DBUG_LIB)      # it is OK to use dbug library in statically
+  #                                             # linked plugin
+
+  SET(HEADERS common.h handshake.h)
+  SET(PLUGIN_SOURCES plugin_client.cc handshake_client.cc
+      log_client.cc common.cc handshake.cc)
+
+  MYSQL_ADD_PLUGIN(authentication_windows_client ${PLUGIN_SOURCES} ${HEADERS}
+    LINK_LIBRARUES Secur32
+    MODULE_ONLY)
+
+ENDIF(WIN32)