fixed -Wreorder warnings


BUILD/SETUP.sh:
  Bug #31326: enabled the -Wreorder warnings
sql/rpl_mi.cc:
  Bug #31326: fixed -Wreorder warnings
storage/heap/ha_heap.cc:
  Bug #31326: fixed -Wreorder warnings
storage/ndb/src/kernel/blocks/backup/Backup.hpp:
  Bug #31326: fixed -Wreorder warnings
storage/ndb/src/kernel/blocks/pgman.cpp:
  Bug #31326: fixed -Wreorder warnings