Fix cmake warning - custom command succeeds without creating own OUTPUT.

sql/CMakeLists.txt

@@ -404,6 +404,7 @@ IF(WIN32 AND MYSQLD_EXECUTABLE)
      COMMAND ${CMAKE_COMMAND} -E make_directory data
      COMMAND ${CMAKE_COMMAND} -E chdir data ${CMAKE_COMMAND}
      ${CONFIG_PARAM} -P ${CMAKE_CURRENT_BINARY_DIR}/create_initial_db.cmake
+     COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/initdb.dep
      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/
      DEPENDS mysqld
   )