""show_check" fails on 64bit platforms": now minimal rec_length
of a HEAP table >= sizeof(void*), hence it's platform-dependant.


mysql-test/r/show_check.result:
  Fix test results for 64-bit platforms.
mysql-test/t/show_check.test:
  Ignore two more columns of output of show table status: it's different
  on 64-bit and 32-bit platforms.