problems with unresolved dependancies on some platforms.


sql/mysql_priv.h:
  Moved my_time_t definitions to tztime.h to avoid mysql_tzinfo_to_sql dependancy
  on mysql_priv.h.
sql/tztime.cc:
  Removed mysql_tzinfo_to_sql dependancy from mysql_priv.h
sql/tztime.h:
  Moved my_time_t definitions to tztime.h to avoid mysql_tzinfo_to_sql dependancy
  on mysql_priv.h.