Bug#11766631 (59780) - Move the client authentication_windows plugin

into the server repository

This patch adds client windows authentication plugin code to the client 
library libmysql (only on Windows platform). The plugin is compiled into 
the library and added to the list of built-in plugins. This way clients 
should be able to connect to a server which uses windows authentication 
plugin even as an SQL user which uses such authentication.

Note: this makes the client library to depend on Secur32 Windows system
library. When building clients, they must be linked against Secur32. 
Command mysql_config --libs correctly lists Secur32 as a required 
dependency.

libmysql/authentication_win/CMakeLists.txt

@@ -0,0 +1,31 @@
+# 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
+
+#
+# Configuration for building Windows Authentication Plugin (client-side)
+#
+
+ADD_DEFINITIONS(-DSECURITY_WIN32)
+ADD_DEFINITIONS(-DDEBUG_ERRROR_LOG)	# no error logging in production builds
+
+SET(HEADERS common.h handshake.h)
+SET(PLUGIN_SOURCES plugin_client.cc handshake_client.cc log_client.cc common.cc handshake.cc)
+
+ADD_CONVENIENCE_LIBRARY(auth_win_client ${PLUGIN_SOURCES} ${HEADERS})
+TARGET_LINK_LIBRARIES(auth_win_client Secur32)
+
+# In IDE, group headers in a separate folder.
+
+SOURCE_GROUP(Headers REGULAR_EXPRESSION ".*h$")