innobase/fil/fil0fil.c:
  Move the declaration of fil_node_t to os0file.h.
  Remove type casting from address-of operation
  (which would break strict aliasing rules)
innobase/include/os0file.h:
  Declare fil_node_t as an opaque structure.
  Replace void* message1 with fil_node_t* message1.
innobase/os/os0file.c:
  Replace void* message1 with fil_node_t* message1.