Bug#11766320 MYSQL SYMBOLIC LINKS NOT WORKING

When MySQL converted from autotools to CMake, the
preprocessor symbol USE_SYMDIR was omitted by mistake.

Without this symbol, the code for checking .sym files
is not built.

This patch defines USE_SYMDIR when built on MS Windows.

cmake/os/Windows.cmake

-# Copyright (C) 2010 Sun Microsystems, Inc
+# Copyright (C) 2010, 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
@@ -192,3 +192,4 @@ IF(NOT HAVE_SIZE_OF_SSIZE_T)
 ENDIF()
 
 SET(FN_NO_CASE_SENSE 1)
+SET(USE_SYMDIR 1)

config.h.cmake

@@ -510,6 +510,7 @@
 #cmakedefine EXTRA_DEBUG 1
 #cmakedefine BACKUP_TEST 1
 #cmakedefine CYBOZU 1
+#cmakedefine USE_SYMDIR 1
 
 /* Character sets and collations */
 #cmakedefine MYSQL_DEFAULT_CHARSET_NAME "@MYSQL_DEFAULT_CHARSET_NAME@"