`DROP DATABASE` needs Super_priv patch based on MySQL 5.6.16

mysql-5.6.16_drop_database_needs_super_priv.patch

*** sql/sql_db.cc.orig  2014-01-15 00:38:00.000000000 +0900
--- sql/sql_db.cc       2014-02-28 17:13:19.383810416 +0900
***************
*** 44,49 ****
--- 44,51 ----
  #endif
  #include "debug_sync.h"

+ #include "sql_parse.h"    // check_global_access
+
  #define MAX_DROP_TABLE_Q_LEN      1024

  const char *del_exts[]= {".frm", ".BAK", ".TMD", ".opt", ".OLD", NullS};
***************
*** 772,777 ****
--- 774,782 ----

  bool mysql_rm_db(THD *thd,char *db,bool if_exists, bool silent)
  {
+   if (check_global_access(thd, SUPER_ACL))
+     DBUG_RETURN(0);
+
    ulong deleted_tables= 0;
    bool error= true;
    char        path[2 * FN_REFLEN + 16];