Move Windows port to MinGW

- Add calls to WSAStartup in the network code as required by
  Winsock.
- Add Windows-specific init_random_state function which uses the
  Crypto API.
- Move Windows port to MinGW and update build system to create a
  64-bit binary by default.
- Install text files as .rtf so they won't open in Notepad by default
  (Wordpad understands Unix line endings; Notepad doesn't).
- Simplify WiX installer code.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/diskutil.c b/diskutil.c
index 47d739b..feb8852 100644
--- a/diskutil.c
+++ b/diskutil.c
@@ -31,7 +31,7 @@
 		flist_del(&slave->slavelist);
 		slave->users--;
 	}
-	
+
 	fio_mutex_remove(du->lock);
 	sfree(du);
 }