build fixes

sql/event.cc:
  - make this not unsigned. gcc complains
sql/event_timed.cc:
  acl_getroot_no_password() is not there in libmysqld, disable it's usage
  in this case.
sql/set_var.cc:
  fix for the broken build of Serg. gcc seems to be pretty happy without
  the return and returns the value of the last statement

sql/event.cc

@@ -1239,7 +1239,7 @@ int db_drop_event(THD *thd, event_timed *et, bool drop_if_exists,
 {
   TABLE *table;
   Open_tables_state backup;
-  uint ret;
+  int ret;
 
   DBUG_ENTER("db_drop_event");
   ret= EVEX_OPEN_TABLE_FAILED;

sql/event_timed.cc

@@ -1093,6 +1093,7 @@ event_timed::execute(THD *thd, MEM_ROOT *mem_root)
   DBUG_PRINT("info", ("master_access=%d db_access=%d",
              thd->security_ctx->master_access, thd->security_ctx->db_access));
   change_security_context(thd, &save_ctx);
+
   DBUG_PRINT("info", ("master_access=%d db_access=%d",
              thd->security_ctx->master_access, thd->security_ctx->db_access));
   if (mysql_change_db(thd, dbname.str, 0))
@@ -1108,6 +1109,7 @@ event_timed::execute(THD *thd, MEM_ROOT *mem_root)
     ret= -99;
   }
   restore_security_context(thd, save_ctx);
+
   DBUG_PRINT("info", ("master_access=%d db_access=%d",
              thd->security_ctx->master_access, thd->security_ctx->db_access));
 
@@ -1145,6 +1147,7 @@ event_timed::change_security_context(THD *thd, Security_context **backup)
 {
   DBUG_ENTER("event_timed::change_security_context");
   DBUG_PRINT("info",("%s@%s@%s",definer_user.str,definer_host.str, dbname.str));
+#ifndef NO_EMBEDDED_ACCESS_CHECKS
   *backup= 0;
   if (acl_getroot_no_password(&sphead->m_security_ctx, definer_user.str,
                               definer_host.str, definer_host.str, dbname.str))
@@ -1154,7 +1157,7 @@ event_timed::change_security_context(THD *thd, Security_context **backup)
   }
   *backup= thd->security_ctx;
   thd->security_ctx= &sphead->m_security_ctx;
-
+#endif
   DBUG_RETURN(FALSE);
 }
 
@@ -1171,8 +1174,10 @@ void
 event_timed::restore_security_context(THD *thd, Security_context *backup)
 {
   DBUG_ENTER("event_timed::change_security_context");
+#ifndef NO_EMBEDDED_ACCESS_CHECKS
   if (backup)
     thd->security_ctx= backup;
+#endif
   DBUG_VOID_RETURN;
 }
 

sql/set_var.cc

@@ -3488,7 +3488,7 @@ byte *sys_var_thd_dbug::value_ptr(THD *thd, enum_var_type type, LEX_STRING *b)
     DBUG_EXPLAIN_INITIAL(buf, sizeof(buf));
   else
     DBUG_EXPLAIN(buf, sizeof(buf));
-  (byte*) thd->strdup(buf);
+  return (byte*) thd->strdup(buf);
 }
 
 /****************************************************************************