merge r12009 from branch 2.2 to trunk

bug 2416 fixed: the CAST function in MySQL seems to return unexpected results,
depending on MySQL version. As a consequence it was producing virtual years in
calendar display.



git-svn-id: http://piwigo.org/svn/trunk@12010 68402e56-0260-453c-a942-63ccdbb3a9ee

include/dblayer/functions_mysql.inc.php

@@ -595,7 +595,7 @@ function pwg_db_concat_ws($array, $separator)
 
 function pwg_db_cast_to_text($string)
 {
-  return 'CAST('.$string.' AS CHAR)';
+  return $string;
 }
 
 /**