innobase/log/log0recv.c:
  Remove GCC 4.0.0 warnings about possibly uninitialized variables.
innobase/row/row0umod.c:
  row_undo_mod_undo_also_prev_vers(): Remove unused parameter thr,
  always initialize *undo_no to remove GCC 4.0.0 warning
innobase/trx/trx0undo.c:
  trx_undo_write_xid(): Remove warning about signedness mismatch,
  add const qualifier to parameter xid.
sql/ha_innodb.cc:
  Add proper casts from ulonglong to ulong in fprintf statements.