REAL_PATH was rewritten for DATA DIRECTORY (doesn't get calculated for each table open, and won't be calculted more then once now).
Windows warnings cleanup.

I am still get a weird warning about file descriptors closed multiple times.


storage/archive/ha_archive.cc:
  Cleanup from Windows warnings.
  REAL_PATH has been rewritten.
storage/archive/ha_archive.h:
  real_path holds the full path of the non-symlinked version