- Fixes for type-conversion
  (time_t   is not interchangeable  with  my_time_t on Windows as time_t s 64 bit while my_time_t is long)
- BIGENDIAN-> ARCH_BIGENDIAN . 
  BIGENDIAN constant  is defined in winsock2.h (as 0)
- added explicit cast for longlong->double conversion in sql/item.h  (fixed many warnings) 

Also, HAVE_SNPRINTF is now defined and snprintf is defined to _snprintf in config-win.h