Fixed c++11 narrowing error

sql/table.cc:8561:42: error: non-constant-expression cannot be narrowed
                             from type 'uint' (aka 'unsigned int') to
                             '__darwin_suseconds_t' (aka 'int') in
                             initializer list [-Wc++11-narrowing]
  timeval end_time= {thd->query_start(), uint(thd->query_start_sec_part())};
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sql/table.cc:8561:42: note: insert an explicit cast to silence this issue
  timeval end_time= {thd->query_start(), uint(thd->query_start_sec_part())};
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                         static_cast<__darwin_suseconds_t>( )

sql/table.cc

@@ -8558,7 +8558,7 @@ bool TR_table::update(ulonglong start_id, ulonglong end_id)
     return true;
 
   store(FLD_BEGIN_TS, thd->transaction_time());
-  timeval end_time= {thd->query_start(), long(thd->query_start_sec_part())};
+  timeval end_time= {thd->query_start(), int(thd->query_start_sec_part())};
   store(FLD_TRX_ID, start_id);
   store(FLD_COMMIT_ID, end_id);
   store(FLD_COMMIT_TS, end_time);