Build cleanups

- Simplify sql-bench installation, 
do not try to resolve names : this leads to probem
if builddir is symlink located on different filesystem.
(reported by alik)

- Make WITHOUT_XXX (disabling plugin) work for DEFAULT
plugins. Prior to the patch is behaved just like 
MANDATORY.

- LINK_LIBRARIES in MYSQL_ADD_PLUGIN had no effect for
statically linked plugins.

- Fix constant rebuild of initdb target on Windows.

sql/CMakeLists.txt

@@ -42,7 +42,6 @@ SET (SQL_SOURCE
               ../sql-common/client.c derror.cc des_key_file.cc
                discover.cc ../libmysql/errmsg.c field.cc  field_conv.cc 
                filesort.cc gstream.cc sha2.cc
-               ha_partition.cc
                handler.cc hash_filo.h sql_plugin_services.h
                hostname.cc init.cc item.cc item_buff.cc item_cmpfunc.cc 
                item_create.cc item_func.cc item_geofunc.cc item_row.cc 
@@ -266,18 +265,20 @@ IF(WIN32 AND MYSQLD_EXECUTABLE)
   ENDIF()
   MAKE_DIRECTORY(${CMAKE_CURRENT_BINARY_DIR}/data)
   ADD_CUSTOM_COMMAND(
-     OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/data/mysql/user.frm
+     OUTPUT initdb.dep
      COMMAND ${CMAKE_COMMAND}
      ${CONFIG_PARAM} -P ${CMAKE_CURRENT_BINARY_DIR}/create_initial_db.cmake
      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/data
+     COMMAND  ${CMAKE_COMMAND} -E touch initdb.dep
+     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
      DEPENDS mysqld
   )
   ADD_CUSTOM_TARGET(initial_database  
     ALL
-    DEPENDS  ${CMAKE_CURRENT_BINARY_DIR}/data/mysql/user.frm
+    DEPENDS  initdb.dep
   )
-  INSTALL(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/data DESTINATION . COMPONENT DataFiles
-    PATTERN "bootstrap.sql" EXCLUDE)
+  INSTALL(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/data DESTINATION . 
+  COMPONENT DataFiles PATTERN "initdb.dep" EXCLUDE  PATTERN "bootstrap.sql" EXCLUDE)
 ELSE()
   # Not windows or cross compiling, just install an empty directory
   INSTALL(FILES ${DUMMY_FILE} DESTINATION data/mysql)